Etymology
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volvox (n.)

genus of fresh-water algae, 1798, from Latin volvere "to roll," from PIE root *wel- (3) "to turn, revolve." So called from their motion.

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monotype (n.)

1881 in biology, "the single or sole type of a species in its genus, a genus in its family, etc.;" 1882 in printers' arts, "a print from a picture painted on a metal plate" (only one proof can be made, as the picture is transferred to the paper); 1893 as a brand name of typesetting machine; see mono- + type. Related: Monotypic (1878 in the biological sense)

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ficus (n.)

c. 1400, from Latin ficus "fig, fig tree" (see fig). With capital letter, as the name of a large genus of trees and shrubs, chosen by Linnaeus (1753).

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Cereus (n.)

cactus genus, 1730, from Latin cereus "waxen, waxy," from cera "wax" (see cero-). So called from its shape, which suggests a wax candle.

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Pongo (n.)

ape genus including the orangutan; 1620s as the name of a large anthropoid ape of Africa, from Kongo (Bantu) mpongi. The name later was transferred to the orangutans of Borneo (1798). Related: Pongoid.

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trichomoniasis (n.)

1915, with -iasis + trichomonas, genus of a family of flagellate parasites, from tricho-, Latinized form of Greek trikho-, combining form of thrix (genitive trikhos) "hair" + -monas.

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endorphin (n.)

"chemical which occurs naturally in the brain and works like morphine," 1975, from French endorphine. First element from endogène "endogenous, growing within" (see endo- + genus); second element from morphine.

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axolotl (n.)

genus of Mexican salamanders, 1786, from Spanish, from Nahuatl, literally "servant of water," from atl "water" + xolotl "slippery or wrinkled one, servant, slave" [see Frances Karttunen, "An Analytical Dictionary of Nahuatl"].

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brontothere (n.)

extinct genus of gigantic mammals, 1877, Modern Latin, from Greek brontē "thunder" (probably imitative) + Greek thērion "beast, wild beast, hunted animal" (from PIE root *ghwer- "wild beast").

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gardenia (n.)

shrub genus, 1757, Modern Latin, named for Scottish-born American naturalist Dr. Alexander Garden (1730-1791), Vice President of the Royal Society, + abstract noun ending -ia.

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