Definition of monactine in US English:

monactine

adjective

Zoology
rare
  • = monactinal.

noun

Zoology
rare
  • A monactinal sponge spicule.

Origin

Late 19th century; earliest use found in Encyclopaedia Britannica. From mono- + actine.

Pronunciation

monactine

/mɒˈnaktɪn/