noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A large heterocyclic aromatic ring consisting, at the core, of three pyrroles and one pyrroline coupled through four methine linkages. countable, uncountable
2. 2
   Archaic form of chlorine. alt-of, archaic, countable, uncountable

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