Definition of membranule in US English:

membranule

noun

Entomology
  • A small membrane; specifically a small triangular opaque region at the base of the hindwing in some dragonflies.

Origin

Mid 19th century; earliest use found in Robert Mayne (1808–1868). From classical Latin membrānula membranula; compare -ule.

Pronunciation

membranule

/ˈmɛmbrənjuːl/