noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A hydrozoan reproductive zooid or simple form of gonophore which does not become medusoid in form or structure
2. 2
   An early or simple larval stage of trematode worms and some other invertebrates, which is capable of reproducing other germ cells by asexual generation; a redia.

Etymology

From sporo- + sac.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.