Definition of pillow

• n. - 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.
• n. - A piece of metal or wood, forming a support to equalize pressure; a brass; a pillow block.
• n. - A block under the inner end of a bowsprit.
• n. - A kind of plain, coarse fustian.
• v. t. - To rest or lay upon, or as upon, a pillow; to support; as, to pillow the head.