noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Plankton normally living in the top hundred fathoms of a body of water (at a depth of about 180 metres or less). countable, uncountable

Etymology

From epi- + plankton.

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