Definition of tickseed in US English:

tickseed

noun

North American
  • another term for coreopsis
    • ‘All tickseeds in Florida, except Swamp Tickseed, have yellow ray flowers.’
    • ‘They were continuing to center their nectaring activities on tickseeds, thistles, and goldenrod.’
    • ‘The flowers (especially the middle) look like some tickseeds, but the leaves look much more like a helianthus.’
    • ‘Look closely at the beautiful flowers common to this region including tickseeds and wild petunias.’
    • ‘Many other tickseeds have similar flowers, but differ vegetatively and ecologically.’

Origin

Mid 16th century: so named because of the resemblance of the seed to a parasitic tick.

Pronunciation

tickseed

/ˈtiksēd/