Definition of pentastomid in US English:

pentastomid

noun

Zoology
  • Any of numerous parasitic wormlike animals of the crustacean class Pentastomida (often regarded as a distinct phylum or subphylum), which infest the lungs and nasal passages of vertebrates.

adjective

Zoology
  • Of or relating to pentastomids, or the class Pentastomida.

Origin

Early 20th century. From scientific Latin Pentastomida, class name from Pentastoma, genus name + -ida.