Etymology
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coccus (n.)

1763 as an insect genus (including the cochineal bug and the kermes); 1883 as a type of bacterium; from Greek kokkos "grain, seed, berry" (see cocco-). Related: Coccoid.

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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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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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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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spirochete (n.)
1877, from Modern Latin Spirochæta, the genus name, from spiro- Modern Latin combining form of Greek speira "a coil" (see spiral (adj.)) + Greek khaite "hair" (see chaeto-).
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sphagnum (n.)
genus of mosses, peat-moss, 1741, Modern Latin, from Latin sphagnos, a kind of lichen, from Greek sphagnos "a spiny shrub, a kind of moss," of unknown origin. Related: Sphagnous.
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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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zinnia (n.)
genus of herbs of the aster family, 1767, from Modern Latin (Linnæus, 1763), named for German botanist Johann Gottfried Zinn (1729-1759) + abstract noun ending -ia.
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