Webster's Revised Unabridged Dictionary · 1913

Buff

Buff (buf) , noun

[Old English buff, buffe, buff, buffalo, French buffle buffalo. See Buffalo.]

1.
A sort of leather, prepared from the skin of the buffalo, dressed with oil, like chamois; also, the skins of oxen, elks, and other animals, dressed in like manner.
A suit of buff. — Shakespeare
2.
The color of buff; a light yellow, shading toward pink, gray, or brown.
A visage rough, Deformed, unfeatured, and a skin of buff. — Dryden
3.
A military coat, made of buff leather. — Shakespeare
4.
(Medicine) The grayish viscid substance constituting the buffy coat. See Buffy coat, under Buffy, a.
5.
(Mechanics) A wheel covered with buff leather, and used in polishing cutlery, spoons, etc.
6.
The bare skin; as, to strip to the buff. [Colloquial]
To be in buff is equivalent to being naked. — Wright

Buff , adjective

1.
Made of buff leather. — Goldsmith
2.
Of the color of buff.
Collocations (3)
Buff coat , a close, military outer garment, with short sleeves, and laced tightly over the chest, made of buffalo skin, or other thick and elastic material, worn by soldiers in the 17th century as a defensive covering.
Buff jerkin , originally, a leather waistcoat; afterward, one of cloth of a buff color. [Obsolete] — Nares
Buff stick (Mechanics) , a strip of wood covered with buff leather, used in polishing.

Buff , transitive verb

to polish with a soft cloth, especially one similar to a buff. See Buff, n., 5.

Buff , transitive verb

[Old French bufer to cuff, buffet. See Buffet a blow.]

To strike. [Obsolete] — B. Jonson

Buff , noun

[See Buffet.]

A buffet; a blow; -- obsolete except in the phrase “Blindman's buff.” See blindman's buff.
Nathless so sore a buff to him it lent That made him reel. — Spenser

Buff , adjective

[Of uncertain etymol.]

Firm; sturdy.
And for the good old cause stood buff, 'Gainst many a bitter kick and cuff. — Hudibras