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long-day plant

[ lông′dā′ ]

A plant that flowers only after being exposed to light periods longer than a certain critical length, as in summer. Spinach, lettuce, and some varieties of wheat are long-day plants. Compare day-neutral plant short-day plant. See more at photoperiodism.

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Nearby words

  1. long-case clock,
  2. long-chain,
  3. long-coats,
  4. long-dated,
  5. long-day,
  6. long-distance,
  7. long-drawn-out,
  8. long-eared owl,
  9. long-faced,
  10. long-form
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.