pinni-|ˈpɪnɪ|combining form of L. pinna, penna wing, fin (cf. ancient L. pennifer, pinniger, etc.). Hence piˈnniferous[-ferous], piˈnnigerous[-gerous]adjs., bearing or having fins. (Cf. penniferous, pennigerous.) pinniˈnervate, pinninervedadjs.Bot., pinnately veined (= penninervate). pinniˈsecteda.Bot.= pinnatifid, or ? pinnatisect(see pinnati-). pinniˈtarsala.[tarsal], ‘having pinnate feet, as a swimming-crab’. pinnitenˈtaculatea.[tentaculate], ‘having pinnate tentacles, as a polyp’. See also pinniform, -grade, -ped.1858Mayne Expos.Lex., Pinniferus, having or bearing fins: *pinniferous.1656Blount Glossogr., *Pinnigerous,..that hath fins; finned like a fish.1893Syd. Soc.Lex., *Pinninervate, see Penninervate.Ibid., *Pinnisected, the same as Pinnatifid.
pinni-/ˈpɪni/combining form.
ORIGIN: Repr. Latinpinna, penna wing, fin: see -i-.
Chiefly Zoology & Botany. Of or pertaining to a fin or fins; pinnate, pinnately.