noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A positively-charged cation with the formula HCO⁺, related to formaldehyde, aldehydes, and formyl. uncountable

Synonyms

All synonyms

aldehydeformaldehydeformylformyl cationformyl cation

Etymology

From formyl + -ium.

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