Webster's Revised Unabridged Dictionary · 1913

MASH

MASH , noun

(Military) An abbreviation for Mobile Army Surgical Hospital, consisting of the equipment and personnel required to perform emergency operations on injured soldiers, located in tents near the front lines of combat; as, he worked in the 25th MASH.

Mash , noun

A mesh. [Obsolete]

Mash , noun

[Akin to German meisch, maisch, meische, maische, mash, wash, and prob. to Anglo-Saxon miscian to mix. See Mix.]

1.
(Brewing) A mass of mixed ingredients reduced to a soft pulpy state by beating or pressure; a mass of anything in a soft pulpy state. Specifically (Brewing), ground or bruised malt, or meal of rye, wheat, corn, or other grain (or a mixture of malt and meal) steeped and stirred in hot water for making the wort.
2.
A mixture of meal or bran and water fed to animals.
3.
A mess; trouble. [Obsolete] — Beau. & Fl
Collocations (1)
Mash tun , a large tub used in making mash and wort.

Mash , transitive verb

[Akin to German meischen, maischen, to mash, mix, and prob. to mischen, English mix. See 2d Mash.]

(Brewing) To convert into a mash; to reduce to a soft pulpy state by beating or pressure; to bruise; to crush; as, to mash apples in a mill, or potatoes with a pestle.
(Brewing) to convert, as malt, or malt and meal, into the mash which makes wort.
Collocations (1)
Mashing tub , a tub for making the mash in breweries and distilleries; -- called also mash tun, and mash vat.