Online Etymology Dictionary

capital letter (n.): late 14c.; see capital (adj.). So called because it is at the "head" of a sentence or word.
bris (n.): Yiddish word for the circumcision ceremony, from bris milah, Ashkenazi pronunciation of brit milah "covenant of circumcision."
bookcase (n.): 1726, from book (n.) + case (n.2). An Old English word for this was bocfodder.
tropho-: before vowels, troph-, word-forming element meaning "nourishment, food," from comb. form of Greek trophe "nourishment" (see -trophy).
unsecure (adj.): 1630s, from un- (1) "not" + secure (adj.). A useful differentiation from insecure since the latter word acquired a psychological sense.
unseparable (adj.): late 14c. from un- (1) "not" + separable (adj.). The usual word now is inseparable.
uro-: word-forming element meaning "urine," from comb. form of Greek ouron "urine" (see urine).
utero-: before vowels uter-, word-forming element, from comb. form of Latin uterus (see uterus).
vitro-: word-forming element meaning "glass," from comb. form of Latin vitrum "glass" (see vitreous).
undisputable (adj.): 1590s, from un- (1) "not" + disputable (see dispute (v.)). The usual word is indisputable. Related: Undisputably.
unexcusable (adj.): late 14c., from un- (1) "not" + excusable. The usual word is inexcusable. Related: Unexcusably.
unpenetrable (adj.): c. 1400, from un- (1) "not" + penetrable (adj.). The usual word now is impenetrable.
Afro-: word-forming element meaning "African," from Latin Afr-, stem of Afer, Afri "African" (see Africa), or directly from African.
Zulu (n.): one of a Bantu people of South Africa, 1824, a native name. As radio code word for -z- from 1960.
Todd: masc. proper name, also a surname (late 12c.), from Middle English todde "fox," a Northern English word of unknown origin.
addictive (adj.): 1815, a word in chemistry and medicine; 1939 in the narcotics sense, from addict (v.) + -ive. Related: Addictively; addictiveness.
agro-: word-forming element meaning "pertaining to agriculture or cultivation," from Greek agro-, comb. form of agros "field" (see acre).
-gamous: word-forming element meaning "marrying," from Greek gamos "marriage, a wedding" (see gamete) + -ous.
-gamy: word-forming element meaning "marriage" in anthropology and "fertilization" in biology, from Greek -gamia, from gamos "marriage" (see gamete).
allo-: word-forming element meaning "other," from Greek allo-, comb. form of allos "other, different" (see alias (adv.)).
hippo-: before vowels, hipp-, word-forming element meaning "horse," from Greek hippo-, from hippos "horse," from PIE *ekwo- (see equine).
autosuggestion (n.): also auto-suggestion, 1879, a hybrid from auto- + suggestion. The idea, and probably the model for the word, originally from French.
hygro-: word-forming element meaning "wet, moist; moisture," from Greek hygros "wet, moist, fluid."
-ization: word-forming element making nouns of action, process, or state; see -ize + -ation.
anemo-: before vowels anem-, word-forming element meaning "wind," from comb. form of Greek anemos (see anemone).
anomalo-: word-forming element meaning "deviating from the usual, abnormal," from comb. form of Greek anomalos "uneven, irregular" (see anomaly).
arterio-: word-forming element meaning "arterial," from Latinized comb. form of Greek arteria "windpipe; artery" (see artery).
homo- (2): word-forming element meaning "homosexual," abstracted since early 20c. from homosexual, and ultimately identical to homo- (1).
gyno-: word-forming element especially in modern medical and botanical words equivalent to gyneco-.
gyro-: word-forming element meaning "gyrating" or "gyroscope," from comb. form of Greek gyros "a ring, circle" (see gyre (n.)).
dumbledore (n.): 1787, noted as a dialect word in Hampshire, Cornwall, etc. for "a bumblebee."
reportage (n.): "the describing of events," 1877; see report (v.) + -age. From 1881 as a French word in English.
developmental (adj.): 1830, from development + -al (1). Developmentalist (1862) was a word for "follower of the theory of evolution."
deviance (n.): 1944; see deviant + -ance. A sociologists' word, perhaps coined because statisticians and astronomers already had claimed deviation.
freer (n.): "one who sets free," c. 1600, from free + -er (1). An Old English word for this was freogend.
fud (n.): "backside, buttocks," 1785, a Scottish and Northern dialect word of unknown origin; perhaps from Scandinavian.
-fid: word-forming element meaning "split, divided into parts," from Latin -fidus, related to findere "to split" (see fissure).
fragmentary (adj.): 1610s, but mainly a dictionary word until early 19c., from fragment (n.) + -ary. Fragmental was used from 1798.
fattening (adj.): "that makes fat," 1690s, present participle adjective from fatten. Earlier word was fatting (1530s).
finis (n.): Latin, literally "the end" (see finish (v.)). Word often placed 15c.-19c. at the end of a book.
keno-: before vowels, ken-, word-forming element meaning "empty," from Greek kenos "empty," from PIE root *ken- (3) "empty."
kineto-: word-forming element used from late 19c. and meaning "motion," from Greek kineto-, comb. form of kinein "to move" (see cite).
-lith: word-forming element meaning "stone, rock," from Modern Latin -lithus or French -lithe (see -lith).
laburnum (n.): small, leguminous tree native to the Alps, 1570s, from Latin laburnum (Pliny), a word of unknown origin; perhaps from Etruscan.
-later: word-forming element meaning "worshipper," from Greek -latres "worshipper of," related to latreia "worship" (see -latry).
indices (n.): according to OED, the plural form of index preferable in scientific and mathematical senses of that word.
iatro-: word-forming element meaning "a physician; medicine; healing," from Greek iatros "healer, physician" (see -iatric).
saboteur (n.): 1912 (from 1909 as a French word in English), a borrowing of the French agent noun from sabotage (see sabotage (n.)).
crepitus (n.): c. 1810, from Latin crepitus "a rattling, creaking;" another word for crepitation, which is from the same root.
decomposition (n.): 1762, from de- + composition. An earlier word in the same form meant "further compounding of already composite things" (1650s).