Definition of protegulum in US English:

protegulum

noun

Zoology
  • In brachiopods: the initial or embryonic form of the shell, or of each valve of the shell.

Origin

Late 19th century. From pro- + classical Latin tēgulum roofing from tegere to cover + -ulum.

Pronunciation

protegulum

/prə(ʊ)ˈtɛɡjʊləm/