What does "ream" mean?

Additional senses

1. 2.To cream; to mantle. [Scot.] A huge pewter measuring pot which, in the language of the hostess, reamed with excellent claret. Sir W. Scott.
2. 3.To stretch out; to draw out into thongs, threads, or filaments.
3. 4.A bundle, package, or quantity of paper, usually consisting of twenty quires or 480 sheets. Printer's ream, twenty-one and a half quires. [Eng.] A common practice is now to count five hundred sheets to the ream. Knight.
4. 5.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.