LATH'ER, verb intransitive To form a foam with water and soap; to become froth, or frothy matter. LATH'ER, verb transitive To spread over with the foam of soap. LATH'ER, noun 1. Foam or froth made by soap moistened with water. 2. Foam or froth from profuse sweat, as of a horse.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI