Definition of protrichocyst in English:

protrichocyst

noun

Zoology
  • (In various ciliate protozoans) each of the minute sac-like organelles arranged in rows near the surface of the cell which discharge mucoid material; a mucocyst.

Origin

1930s; earliest use found in Gary Calkins (1869–1943). After German Protrichocyste, so called as they were thought to be undeveloped trichocysts.