Definition of parmeliaceous in US English:

parmeliaceous

adjective

Botany
  • Belonging to or characteristic of the genus Parmelia of foliose lichens or the large family Parmeliaceae to which this genus belongs.

Origin

Late 19th century; earliest use found in Edward Tuckerman (1817–1886). Either from scientific Latin Parmeliaceae, family name + -ous, or from scientific Latin Parmelia, genus name (E. Acharius Methodus qua Omnes Detectos Lichenes ii. 153; from Hellenistic Greek πάρμη small round shield (from classical Latin parma, probably a loanword) + εἰλεῖν to shut in, of uncertain origin) + -aceous.

Pronunciation

parmeliaceous

/ˌpɑːmiːlɪˈeɪʃəs/