In marine zoology, the external or outer layer of certain organisms, particularly referring to outer body structures.
From Greek ektos 'outside' + -eron suffix used in biological nomenclature. A technical term in zoological classification describing external morphological features.
Ecteron is one of those beautiful dead-end technical words—it's so specialized that even many marine biologists might not use it, but it perfectly captures the Greek root system that lets scientists name the 'outside parts' of creatures.
Complete word intelligence in one call. Free tier — 50 lookups/day.