tankmate

English

Etymology

From tank +‎ -mate.

Noun

tankmate (plural tankmates)

  1. An aquarium fish that shares the same tank as another.
    • 2001, Julian Sprung, Invertebrates: A Quick Reference Guide, page 158:
      Dardanus megistios [sic] pauses to consider the meaning of life as it chews the remains of a tankmate.
      Image caption