proconcave

English

Etymology

From pro- +‎ concave.

Adjective

proconcave (not comparable)

  1. (malacology) In reference to ribs on shells, with the shape of a concave bend towards the aperture, but initially straight.
    • 2016, Sreepat Jain, Fundamentals of Invertebrate Palaeontology: Macrofossils‎[1], pages 66–67:
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