Describing a bivalve mollusk that has adductor muscles of noticeably different sizes on opposite ends of its shell.
From heteromyaria with the adjectival suffix '-an.' Emerged in malacological taxonomy to distinguish mollusks based on muscle symmetry.
Some oysters are evolutionary optimists—they use a huge muscle on one end to clamp shut hard, but only need a tiny muscle on the other end, perfectly adapted to how they actually close!
Complete word intelligence in one call. Free tier — 50 lookups/day.