noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A divalent radical in which a cyclononane ring is fused to another ring at a single carbon atom, the two rings being more or less at right angles to one another.

Etymology

From spiro- + cyclononane.

Related phrases

right angle

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