Definition of orthotriaene in US English:

orthotriaene

noun

Zoology
  • A sponge spicule with three short rays projecting at right angles from a longer ray.

Origin

Late 19th century; earliest use found in William Sollas (1849–1936), geologist and anthropologist. From ortho- + triaene.

Pronunciation

orthotriaene

/ˌɔːθə(ʊ)ˈtrʌɪiːn/