proconcave

English

Etymology

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: