Definition of pseudostigma in US English:

pseudostigma

noun

Zoology
  • In certain mites (especially oribatids and trombiculids): either of a pair of pits in the integument, each serving as the socket of a sensillum (pseudostigmatic organ).

Origin

Late 19th century. From pseudo- + stigma. So called on account of the resemblance to a spiracle.

Pronunciation

pseudostigma

/ˈs(j)uːdə(ʊ)ˌstɪɡmə/