1. noun /fɛlt/
a) A cloth or stuff made of matted fibres of wool, or wool and fur, fulled or wrought into a compact substance by rolling and pressure, with lees or size, without spinning or weaving.
It were a delicate stratagem to shoe A troop of horse with felt.
b) A hat made of felt.
To know whether sheep are sound or not, see that the felt be loose.
2. verb /fɛlt/
a) To make into felt, or a feltlike substance; to cause to adhere and mat together. —
b) To cover with, or as with, felt; as, to felt the cylinder of a steam engine.
Wikipedia foundation.