noun
A soft cushion used to support the head in bed.
Any similar head support used for sleep, such as a neck pillow or a hard porcelain pillow. Example: She slept with her head on the pillow.
(geology) A pillow lava.
(engineering) A piece of metal or wood, forming a support to equalize pressure; a brass; a pillow block.
(nautical) A block under the inner end of a bowsprit.
The socket of a pivot.
(uncountable) A kind of plain, coarse fustian.
verb
(transitive) To rest as on a pillow.