Etymology
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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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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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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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capsaicin 

active component of chili peppers, 1851, from capsicum, the genus name of the plants from which it is extracted, + chemical suffixes. Capsicine (1816) was an earlier name of an impure form of it.

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Lycoperdon 
fungus genus established 1700 (Tournefort) for the "puffball" mushrooms, from Latinized form of Greek lykos "wolf" (see wolf (n.)) + perdesthai "to break wind," from PIE imitative root *perd-.
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citrus (adj.)

any tree of the genus Citrus, or its fruit, 1825, from the Modern Latin genus name, from Latin citrus "citron tree," the name of an African tree with aromatic wood and lemon-like fruit, the first citrus fruit to become available in the West. The name, like the tree, is probably of Asiatic origin [OED] or from a lost non-IE Mediterranean language [de Vaan]. But Klein and others trace it to Greek kedros "cedar," perhaps via Etruscan (a suggested by the change of -dr- to -tr-).

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naissance (n.)

"birth, origin," late 15c. (Caxton), from French naissance "birth, parentage, place of origin" (12c.), present participle of naître, from Gallo-Roman *nascere, from Latin nasci "be born" (see genus).

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Dianthus (n.)

large genus of flowering plants including carnations, 1849, from Modern Latin (Linnaeus), literally "flower of Zeus," from Greek Dios, genitive of Zeus "Zeus" (see Zeus) + anthos "flower" (see anther).

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drosophila (n.)

scientific name of the fruit fly, 1829, the genus name, from Modern Latin (Fallén, 1823), from Greek drosos "dew" (which Beekes says is "probably of Pre-Greek origin") + philos "loving" (see -phile).

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Eohippus (n.)
oldest known genus of the horse family, about the size of a fox and first known from fossil remains found in New Mexico, 1879, Modern Latin, from eo- "earliest" + Greek hippos "horse" (from PIE root *ekwo- "horse").
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