Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having six stamens, two of which are shorter than the others, as in most plants of the mustard family.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Belonging to the order Tetradynamia; having six stamens, four of which are uniformly longer than the others.

from The Century Dictionary and Cyclopedia

  • Having six stamens, four longer arranged in opposite pairs, and two shorter, inserted lower down: a relation found only in the flowers of Crucifer├Ž. See cut under stamen.

Etymologies

tetra- + Greek dunamis, strength; see dynamic + -ous.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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