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