Ream n. : Cream; also, the cream or froth on ale.

Ream v. i. : To cream; to mantle.

Ream v. t. : To stretch out; to draw out into thongs, threads, or filaments.

Ream n. : A bundle, package, or quantity of paper, usually consisting of twenty quires or 480 sheets.

Ream v. t. : To bevel out, as the mouth of a hole in wood or metal; in modern usage, to enlarge or dress out, as a hole, with a reamer.

Example:
How many trees are cut for making one Ream of paper?

Taxonomy
sheets, quire, ream, paper, quantity, bundle, 20 quires, free encyclopedia, measurements, paper bale, measures, 4 leaves, booklet, ream of paper, Writing paper, short ream, Paper ream, search.

Defination from the web:
ream. It originally had other meanings: ... A printer's ream was 516 sheets, perhaps to allow for wastage. As part of international standardization, this quantity was changed to 500 sheets. The old value of 480 sheets is now known as a short ream. ...