also: うまだらい
noun
horse tub; washtub for horses
A large tub used for washing horses or giving them water. A somewhat specialized historical term; modern contexts may use more general words like 桶.
昔の馬屋には馬盥が置いてあった。
In old stables, there was a horse tub.
桶 is a general tub or bucket, while 馬盥 specifically refers to a tub for horses.
Compound of 馬 (horse) and 盥 (tub). The reading ばだらい is a contraction of うまだらい.