noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of various aquatic insects, of the family Notonectidae, that swim on their backs.
2. 2
   predaceous aquatic insect that swims on its back and may inflict painful bites wordnet

Synonyms

All synonyms

notonecta undulata

Etymology

From back + swimmer.

Related phrases

pygmy backswimmer

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