Definition of petricolous in US English:

petricolous

adjective

Zoology
rare
  • Inhabiting rock; living on rocks; lithodomous.

Origin

Mid 19th century; earliest use found in Robert Mayne (1808–1868). From scientific Latin petricola, specific name of a type of mollusc (Lamarck Système des Animaux sans Vertèbres 121; from classical Latin petra rock + colere to inhabit: see -colous) + -ous; compare -colous.