Definition of myzostomid in US English:

myzostomid

noun

Zoology
  • Any of various small annelid worms belonging to the class Myzostomida, which have disc-like bodies with suckers and are commensals and ectoparasites of echinoderms, especially crinoids.

adjective

Zoology
  • Of, relating to, or designating a myzostomid.

Origin

Early 20th century; earliest use found in Encyclopaedia Britannica. From scientific Latin Myzostomida, class name from Myzostoma + -ida.

Pronunciation

myzostomid

/ˌmʌɪzə(ʊ)ˈstəʊmɪd/