外骨骼

wàigǔgé
(zoology) exoskeleton

CEDICT

exoskeleton (hard outer structure)

Wiktionary

基于动物身体最外层硬化而形成的骨骼系统

維基詞典

Entry Composition

1 外 wài
  1. outside
  2. in addition
  3. foreign
  4. external
2 骨骼 gǔgé
  1. bones
  2. skeleton