Online Etymology Dictionary

gleen (n.): "gleam of sunlight," 1650s, probably from a Scandinavian dialectal word; compare Swedish dialectal glena, Danish dialectal glene "clear patch of sky."
-escent: word-forming element meaning "beginning, becoming, tending to be," from Latin -escentem (nominative -escens), ending of present participles of verbs in -escere.
-fy: word-forming element meaning "make, make into," from French -fier, from Latin -ficare, from unstressed form of facere "to make, do" (see factitious).
elytro-: word-forming element used for "vagina" in medical terms, from Greek elytron, literally "sheath" (see elytra). Related: Elytral.
sike (n.): also syke, "small stream," a Scottish and Northern word, from Old English sic or cognate Old Norse sik "a ditch, trench."
-scope: word-forming element indicating "an instrument for seeing," from Late Latin -scopium, from Greek -skopion, from skopein "to look at, examine" (see scope (n.1)).
sarco-: before vowels sarc-, word-forming element meaning "flesh, fleshy, of the flesh," from Latinized form of Greek sark-, comb. form of sarx "flesh" (see sarcasm).
seismo-: word-forming element meaning "earthquake," from comb. form of Greek seismos "a shaking, shock; an earthquake," from seiein "to shake," from PIE root *twei- "to agitate, shake, toss."
pash (n.): "head," 1610s, now obsolete or dialectal, of uncertain origin. In 20c. the word was used as an colloquial shortening of passion.
patho-: before vowels path-, word-forming element meaning "Suffering, disease," from Greek patho-, comb. form of pathos "suffering, disease" (see pathos).
nitro-: before vowels nitr-, word-forming element used scientifically and indicating "nitrogen, nitrate" or "nitric acid," from comb. form of Greek nitron (see nitre).
pyelo-: before vowels pyel-, medical word-forming element, 19c., from comb. form of Greek pyelos "oblong trough, bathing-tub," used for "pelvis."
regionalism (n.): 1878, originally of Italy, "tendency toward regional loyalties" (opposed to nationalism), from regional + -ism. As "a word or phrase of local use" is from 1953.
dermato-: before vowels, dermat-, word-forming element meaning "of or pertaining to skin," from Greek dermato- (shortened form dermo-), from derma "skin" (see derma).
rivalry (n.): 1590s; from rival + -ry. Shakespeare has rivality ("Antony and Cleopatra"), but from the secondary sense of the root word and meaning "partnership, equality in rank."
-an: word-forming element meaning "pertaining to," from Latin -anus, adjective suffix, in some cases via French -ain, -en. From PIE *-no-.
ter-: word-forming element meaning "thrice, three times," from Latin ter "thrice," from *tris-, from root of three. Compare Latin tertius "third."
soulmate (n.): 1822 (as soul mate), first attested in Coleridge, from soul (n.1) + mate (n.). One-word form is from early 20c.
initial (n.): "initial letter of a name or surname," 1620s, from initial (adj.) in a specialized sense "standing at the beginning of a word, sentence, etc." (1620s).
loxo-: word-forming element meaning "oblique," before vowels lox-, from Greek loxos "slanting, crosswise, oblique." E.g. loxodromics "art of oblique sailing."
bob (n.1): "act of bobbing," 1540s, from bob (v.1). As a slang word for "shilling" it is attested from 1789, but the signification is unknown.
lyso-: word-forming element indicating "loosening, dissolving, freeing," before vowels lys-, from comb. form of Greek lysis "a loosening" (see lyse).
bloody (v.): 1520s, from bloody (adj.). Related: Bloodied; bloodying. Old English had blodigan "to make bloody," but the modern word seems to be a later formation.
mavis (n.): "song thrush," c. 1400, mavys, from Old French mauvis, of unknown origin; related to Spanish malvis. Breton milfid is a French loan word.
undone (adj.): "not accomplished," c. 1300, from un- (1) "not" + done. The same word meaning "destroyed" is recorded from mid-14c., past participle adjective from undo.
megalo-: word-forming element meaning "large, great, exaggerated," from comb. form of Greek megas "large, great" (stem megal-); see mickle.
melano-: word-forming element meaning "black," from Greek melano-, comb. form of melas (genitive melanos) "black, dark, murky" (see melanin).
mero-: before vowels mer-, word-forming element meaning "part, partial, fraction," from comb. form of Greek meros "part, fraction" (see merit (n.)).
morpho-: before vowels morph-, word-forming element meaning "form, shape," from comb. form of Greek morphe "form, shape; beauty, outward appearance" (see Morpheus).
predate (v.): "to seek prey," 1974, a back-formation from predator, etc. Related: Predated; predating. For the word meaning "antedate; pre-exist," see pre-date.
nycto-: before vowels nyct-, word-forming element meaning "night," from Latinized form of Greek nykto-, comb. form of nyx "night" (see night).
narco-: word-forming element meaning "stupor, narcosis, sleep," from Latinized form of Greek narko-, comb. form of narke "numbness" (see narcotic (n.)).
needways (adv.): "by necessity," c. 1300, a northern and Scottish word, marked as obsolete in OED; from need (n.) + way (n.), with adverbial genitive.
negrification (n.): 1929, in social context, from Negro on model of pacification, etc. Johnson (1755) has the word in the literal sense "act of making black."
nephro-: before vowels nephr-, word-forming element meaning "kidney, kidneys," from nephro-, comb. form of Greek nephros "kidney" (see nephron).
Nessie: colloquial name of the "Loch Ness monster," 1945. The loch is named for the river Ness, probably from an Old Celtic word meaning "roaring one."
paronym (n.): "cognate word," 1846, from Greek paronymos, "formed by a slight change," from para- (see para- (1)) + onyma (see name (n.)). Related: Paronymous (1660s).
patri-: word-forming element used to make terms describing kinship of the father or the paternal line, from Latin patri-, comb. form of pater (see father (n.)).
-ose (1): word-forming element used to make adjectives from nouns, with the meaning "full of, abounding in, having qualities of," from Latin -osus (see -ous).
-osity: word-forming element making nouns from adjectives in -ous, -ose (1); from French -osité, from Latin -ositatem (nominative -ositas), properly -ose + -ity.
ophio-: before vowels ophi-, word-forming element meaning "a snake, serpent," from Greek ophio-, comb. form of ophis "serpent, a snake," from PIE *ogwhi-.
-plasm: word-forming element meaning "a growth, a development; something molded," from Greek -plasma, from plasma "something molded or created" (see plasma).
myo-: before vowels my-, word-forming element meaning "muscle," from comb. form of Greek mys "muscle," literally "mouse" (see muscle (n.)).
myxo-: before vowels myx-, word-forming element meaning "slime, mucus," from comb. form of Greek myxa "mucus; lamp wick" (see mucus).
trick (v.): "deceive by trickery," 1590s, from trick (n.). Related: Tricked; tricking. The sense of "to dress, adorn" (c. 1500) is perhaps a different word entirely.
-poietic: word-forming element meaning "making, producing," from Latinized form of Greek poietikos "capable of making, creative, productive," from poiein "to make, create" (see poet).
petro- (1): before vowels petr-, word-forming element used from 19c., from comb. form of Greek petros "stone," petra "rock" (see petrous).
phanero-: before vowels phaner-, word-forming element meaning "visible, manifest," from Greek phanero-, comb. form of phaneros "visible, manifest," from phainein "to show" (see phantasm).
Pharos (n.): as a word for a lighthouse, 1550s, in reference to the island of Pharos off the coast of Alexandria, on which Ptolemy Philadelphius built a mighty lighthouse.
parmaco-: word-forming element meaning "drug, medicine," also "poison," from Latinized form of Greek pharmako-, comb. form of pharmakon "drug, poison" (see pharmacy).