The Collaborative International Dictionary of English v.0.48:
Pillow \Pil"low\, n. [OE. pilwe, AS. pyle, fr. L. pilvinus.]
1. Anything used to support the head of a person when
reposing; especially, a sack or case filled with feathers,
down, hair, or other soft material.
[Resty sloth] finds the down pillow hard. --Shak.
2. (Mach.) A piece of metal or wood, forming a support to
equalize pressure; a brass; a pillow block. [R.]
3. (Naut.) A block under the inner end of a bowsprit.
4. A kind of plain, coarse fustian.
Lace pillow, a cushion used in making hand-wrought lace.
Pillow bier [OE. pilwebere; cf. LG. b["u]re a pillowcase],
a pillowcase; pillow slip. [Obs.] --Chaucer.
Pillow block (Mach.), a block, or standard, for supporting
a journal, as of a shaft. It is usually bolted to the
frame or foundation of a machine, and is often furnished
with journal boxes, and a movable cover, or cap, for
tightening the bearings by means of bolts; -- called also
pillar block, or plumber block.
Pillow lace, handmade lace wrought with bobbins upon a lace
Pillow of a plow, a crosspiece of wood which serves to
raise or lower the beam.
Pillow sham, an ornamental covering laid over a pillow when
not in use.
Pillow slip, a pillowcase.