DICT.TW Dictionary Taiwan

 Thrum n.  [Written also thrumb.]
 1. One of the ends of weaver's threads; hence, any soft, short threads or tufts resembling these.
 2. Any coarse yarn; an unraveled strand of rope.
 3. Bot. A threadlike part of a flower; a stamen.
 4. Mining A shove out of place; a small displacement or fault along a seam.
 5. Naut. A mat made of canvas and tufts of yarn.
 Thrum cap, a knitted cap. --Halliwell.
 Thrum hat, a hat made of coarse woolen cloth. --Minsheu.