Definition of pyrosome in US English:

pyrosome

noun

Zoology
  • A colonial thaliacean (tunicate) of the genus Pyrosoma.

Origin

Early 19th century; earliest use found in John Pinkerton (1758–1826), historian and poet. From French pyrosome from scientific Latin Pyrosoma; compare -some.

Pronunciation

pyrosome

/ˈpʌɪrə(ʊ)səʊm/