noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A hydrostatic skeleton; a structure found in many cold-blooded organisms and soft-bodied animals, consisting of a fluid-filled cavity, the coelom, surrounded by muscles, and used in movement and changing shape.

Etymology

From hydro- + skeleton.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.