- A sort of very large nail; also, a piece of pointed iron set with points upward or outward.
- Anything resembling such a nail in shape."He wears on his head the corona radiata . . . ; the spikes that shoot out represent the rays of the sun." [Addison.]
- An ear of corn or grain.
- [Bot] A kind of flower cluster in which sessile flowers are arranged on an unbranched elongated axis.
Etymology: Akin to LG. spiker spieker, a large nail, D. spijker, Sw. spik, Dan. spiger, Icel. spīk; all perhaps from L. spica a point, an ear of grain; but in the sense of nail more likely akin to E. spoke of a wheel. Cf. Spine