Etymology
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genus (n.)

(Latin plural genera), 1550s as a term of logic, "kind or class of things" (biological sense dates from c. 1600), from Latin genus (genitive generis) "race, stock, kind; family, birth, descent, origin" (from suffixed form of PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups).

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nightshade (n.)

"plant of the genus solanum," with white flowers and black poisonous berries, Middle English night-shade, from Old English nihtscada, literally "shade of night," perhaps in allusion to the berries; see night + shade (n.). A common Germanic compound, cognates: Dutch nachtschade, German Nachtschatten.

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selachian (adj.)

"cartilaginous fish resembling or related to a shark of the genus selachii," 1835; the genus name from Latinized form of Greek selakhos (plural selakhē) "cartilaginous fish," which is of uncertain origin.

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genotype (n.)
"genetic constitution of an individual," 1910, from German Genotypus (Wilhelm Johannsen, 1909); see gene + type (n.). Earlier the same word was used with a sense of "type-species of a genus" (1897); in this case, the first element is from genus.
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aubergine (n.)

"fruit of the eggplant" (Solanum esculentum), 1775, from French aubergine, from Catalan alberginera (showing typical change of al- to au- in French), from Arabic al-badinjan "the eggplant" (source also of Spanish alberengena, 15c.), from Persian badin-gan, from Sanskrit vatigagama. The plant, native to Southeast Asia, was unknown to the ancients and introduced to the Mediterranean by the Arabs. As the name of a color like that of the eggplant fruit, it is attested from 1895.

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Morus (n.)
genus of mulberry trees, from Latin morus "mulberry tree."
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schistosome (n.)

"parasite of the genus Schistosoma" (1905); the genus name (1858) is a Modern Latin formation from Greek skhistos "divided, cloven" (from skhizein "to split;" see schizo-) + sōma "body" (see somato-). Related: Schistosomatosis "disease caused by schistosomes" (1906).

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Pilobolus (n.)

genus of fungi, Modern Latin, from Greek pilos "felt" (see pileated) + bōlos "a clod, clump."

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platypus (n.)

"Australian duck-mole," 1799, from Modern Latin, from Greek platypous, literally "flat-footed," from platys "broad, flat" (from PIE root *plat- "to spread") + pous "foot," from PIE root *ped- "foot." Originally the genus name, but entomologists had given it earlier to a genus of beetles; it was retained for the species after the genus name was changed in 1800 to Ornithorhyncus. OED has Australian platypussary (1945) "enclosure in which platypuses are kept."

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