noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A bulky part of a molecule, often containing one or more functional groups, attached to a relatively long aliphatic tail or backbone
2. 2
   The group of instances at the head (high end) of a distribution curve

Etymology

From head + group.

Related phrases

functional group

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