proconcave
In reference to ribs on shells, with the shape of a concave bend towards the aperture,…In reference to ribs on shells, with the shape of a concave bend towards the aperture, but initially straight.
Meaning
1 senses(not comparable)In reference to ribs on shells, with the shape of a concave bend towards the aperture, but initially straight.
Origin
From pro- + concave.From pro- + concave.
Wiktionary, CC BY-SA 4.0 · source