[ 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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- long-case clock,
- long-eared owl,
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.