Source : Webster's Revised Unabridged Dictionary (1913)
Thrum \Thrum\, n. [OE. thrum, throm; akin to OD. drom, D. dreum,
G. trumm, lump, end, fragment, OHG. drum end, Icel. ?r["o]mr
edge, brim, and L. terminus a limit, term. Cf. {Term}.]
[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.