a member of the Suctoria; esp. a cyclostomous fish; in modern use spec. a protozoan of the class or subclass Suctoria, the adult form of which is…
A ciliated protozoan of the family Tintinnidæ or the order Tintinnina, often distinguished by a bell-shaped test. Also attributive.
A genus of parasitic microorganisms (originally thought to be protozoans, now recognized as fungi) found in the lungs of mammals; (also pneumocystis)…