noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A surfactant protein, found in the sweat of equines, which allows sweat to penetrate the waterproof coat and there evaporate and cool the animal.

Etymology

From lather + -in from the ability of the protein to produce a frothy lather of sweat on equines.

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