Merriam-Webster's Collegiate® Dictionary, 11th Edition
FELT
I. noun
Etymology: Middle English, from Old English; akin to Old High German filz felt, Latin pellere to drive, beat Date: before 12th century
1. a cloth made of wool and fur often mixed with natural or synthetic fibers through the action of heat, moisture, chemicals, and pressure, a firm woven cloth of wool or cotton heavily napped and shrunk, an article made of felt, a material resembling felt: as, a heavy paper of organic or asbestos fibers impregnated with asphalt and used in building construction, semirigid pressed fiber insulation used in building, feltlike adjective
II. transitive verb
Date: 14th century
to make out of or cover with felt, to cause to adhere and mat together, to make into felt or a similar substance, see: feel