Tickseed \Tick"seed`\, n. [Tick the insect + seed; cf. G. wanzensamen, literally, bug seed.]

1. A seed or fruit resembling in shape an insect, as that of certain plants.

2. (Bot.)
   (a) Same as Coreopsis.
   (b) Any plant of the genus Corispermum, plants of the Goosefoot family.

Source: Webster's Revised Unabridged Dictionary (1913)