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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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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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Morus (n.)
genus of mulberry trees, from Latin morus "mulberry tree."
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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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Weigela (n.)
shrub genus, 1846, from the name of German physician and botanist C.E. Weigel (1748-1831).
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paramecium (n.)

"genus of holotrichous ciliate Infusorial" [OED]; "the slipper-animacule" [Century Dictionary]; 1752, Modern Latin Paramecium, the genus name, coined from Greek paramekes "oblong, oval," from para- "on one side" (see para- (1)) + mēkos "length," related to makros "long," from PIE root *mak- "long, thin."

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xiphias (n.)
1660s, genus of swordfish, from Greek xiphias "swordfish," from xiphos "a sword" (see xiphoid). Related: Xiphioid.
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capsicum (n.)

genus of pepper plants, of unknown origin, perhaps irregularly formed from Latin capsa "box" (see case (n.2)) based on the shape of the fruit. Adopted as a genus name through the writings of French botanist Joseph Pitton de Tournefort (1656-1708), but he did not explain the word. 

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