Online Etymology Dictionary

karoo (n.): "barren table-land in South Africa," 1789, said to be from a Hottentot word meaning "hard," or perhaps "desert."
larrup (v.): "to beat, thrash," 1823, of unknown origin, possibly related to Dutch larpen "to thrash." First mentioned as a Suffolk dialect word.
nana: child's word for "grandmother" or, sometimes, "nurse," first recorded c. 1844 (see nanny).
oddments (n.): 1780, a hybrid with a Latin suffix on a Germanic word, from odd (q.v.), on model of fragments. Related: Oddment.
uni-: word-forming element meaning "having one only," from Latin uni-, comb. form of unus (see one).
-ulent: word-forming element meaning "full of, abounding in," from Latin adjective suffix -ulentus "full of."
quizzical (adj.): 1789, from quiz (n.) "odd or eccentric person" (1782), a word of unknown origin, + -ical. Related: Quizzically.
papoose (n.): 1630s, from Narragansett papoos "child," or a similar New England Algonquian word; said to mean literally "very young."
verbose (adj.): "wordy," 1670s, from Latin verbosus "full of words, wordy," from verbum "word" (see verb). Related: Verbosely (c. 1400); verboseness.
fiesta (n.): 1844 as a Spanish word in English, "Spanish-American religious festival," Spanish, literally "feast" (see feast (n.)).
inconceivable (adj.): 1630s, from in- (1) "not, opposite of" + conceivable. Related: Inconceivably; inconceivability. An Old English word for this was unasmeagendlic.
mammary (adj.): 1680s, from French mammaire (18c.), from Latin mamma "breast," probably from the child's word for "mother" (see mamma).
vestige (n.): c. 1600, from French vestige "a mark, trace, sign" (16c.), from Latin vestigium "footprint, trace," a word of unknown origin.
optimal (adj.): "most favorable," 1890, from Latin optimus (see optimum). Originally a word in biology. Related: Optimally.
Orlon: proprietary name (Du Pont) of synthetic textile fiber, 1948, an invented word (compare nylon).
viva voce: also viva-voce, "by word of mouth," 1580s, Latin, literally "living-voice," ablative of viva vox.
oneself: 1540s, one's self. Hyphenated 18c.; written as one word from c. 1827, on model of himself, itself, etc.
Hephaestus: Greek god of fire and metal-working, from Latinized form of Greek Hephaistos, a pre-Hellenic word of unknown origin.
hibiscus (n.): 1706, from Latin hibiscum, later hibiscus, "marshmallow plant," from Greek hibiskos "mallow," a word of unknown origin, perhaps from Gaulish.
nonetheless: 1839, as phrase none the less; contracted into one word from c. 1930.
ouch: 1837, from Pennsylvania German outch, cry of pain, from German autsch. The Japanese word is itai. Latin used au, hau.
-etic: word-forming element meaning "pertaining to," from Greek -etikos, adjectival suffix for nouns ending in -esis.
Chihuahua (n.): dog breed, 1858, from the city and state in Mexico, said to be from a lost native word that meant "dry place."
anew (adv.): c. 1300, a neue, from Old English of-niowe; see a- (1) + new. One-word form dominant from c. 1400.
anhinga (n.): American fishing bird (also called the snake-bird), 1769, from a Tupi word which sometimes is said to mean "snake-bird."
frumbierdling (n.): Old English word meaning "a youth;" from fruma "first, beginning" (see foremost) + beard (n.) + -ling.
-phane: word-forming element meaning "having the appearance of," from Greek -phanes, from phainein "to show," phainesthai "to appear" (see phantasm).
bongo (n.): 1920, from American Spanish (West Indies, especially Cuba), from a word of West African origin, such as Lokele (Zaire) boungu.
brachy-: word-forming element meaning "short," from Latinized comb. form of Greek brakhys "short" (see brief (adj.)).
bracken (n.): "coarse fern," early 14c., a northern England word from a Scandinavian source (compare Danish bregne, Swedish bräken "fern").
motet (n.): "choral composition on a sacred text," late 14c., from Old French motet (13c.), diminutive of mot "word" (see mot).
bryo-: word-forming element meaning "moss" in scientific compounds, from Greek bryos, bryon "moss."
awhile (adv.): Old English ane hwile "(for) a while" (see while (n.)); usually written as one word since 13c.
shiv (n.): "a razor," 1915, variant of chive, thieves' cant word for "knife" (1670s), of unknown origin.
sub voce: Latin, literally "under the word or heading." A common dictionary reference, usually abbreviated s.v.
tope (v.): "to drink heavily," 1650s, of unknown origin, perhaps ultimately from Italian toppa "done!" a word signifying acceptance of a bet.
ziti (n.): type of tubular pasta, plural of zita (1845), from Italian, said to be a dialect word for "bridegroom."
octo-: word-forming element, before vowels oct-, from comb. form of Latin octo "eight" (see octa-).
-trope: word-forming element meaning "that which turns," from Greek tropos (see trope).
upscale (adj.): 1966, "at the higher end of a scale, superior," a commercial word, from up (adv.) + scale (v.3).
-vorous: word-forming element meaning "eating," from Latin -vorous, from stem of vorare "to devour" (see voracity).
vino (n.): "inferior wine," 1919, colloquial, from the Italian and Spanish word for "wine," from Latin vinum (see vine (n.)).
twizzle (v.): "to twist, form by twisting" (transitive), 1788, apparently a made-up word suggested by twist. Related: Twizzled; twizzling.
unbeseeming (adj.): 1580s, "not befitting, inappropriate, unsuitable," from un- (1) "not" + beseeming. A common 17c. word.
Napa: California county noted for wines, perhaps from a Southern Patwin (Wiuntun) word meaning "homeland."
Tlingit (n.): Indian group in southwestern Alaska and adjacent parts of Canada, 1865, the people's word for themselves, literally "human beings."
anywise (adv.): Old English ænige wisan, from any + wise (n.). One-word form from c. 1200.
anarchist (n.): 1670s; see anarchy + -ist. The word got a boost into modernity from the French Revolution.
seaweed (n.): 1570s, from sea + weed (n.). An Old English word for it was sæwar; also fleotwyrt ('float-wort').
Cannes: city on the French Riviera, perhaps from a pre-Indo-European word *kan, meaning "height." The film festival dates from 1946.