Definition of peritreme in US English:

peritreme

(also peritrema)

noun

Zoology
  • A small chitinous ring or tube surrounding a spiracle or breathing hole in some insects and arachnids, especially acari.

Origin

Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist. From peri- + ancient Greek τρηματ-, τρῆμα perforation, hole.

Pronunciation

peritreme

/ˈpɛrɪtriːm/