Definition of spike

• n. - A sort of very large nail; also, a piece of pointed iron set with points upward or outward.
• n. - Anything resembling such a nail in shape.
• n. - An ear of corn or grain.
• n. - A kind of flower cluster in which sessile flowers are arranged on an unbranched elongated axis.
• v. t. - To fasten with spikes, or long, large nails; as, to spike down planks.
• v. t. - To set or furnish with spikes.
• v. t. - To fix on a spike.
• v. t. - To stop the vent of (a gun or cannon) by driving a spike nail, or the like into it.
• n. - Spike lavender. See Lavender.