American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Botany Facing outward; turned away from the axis: extrorse anthers.
Century Dictionary and Cyclopedia
- In botany, turned outward: applied to an anther which is turned away from the axis of the flower and faces the perianth.
- In zoology, turned out or away from the body: correlated with antrorse, introrse, and retrorse.
GNU Webster's 1913
- adj. (Bot.) Facing outwards, or away from the axis of growth; -- said esp. of anthers occupying the outer side of the filament.
- Late Latin extrōrsus, turned outward (modeled on Latin intrōrsum, turned inward) : Latin extrā, outside; see extra- + Latin versus, past participle of vertere, to turn; see wer-2 in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Alexander Braun notices the transformation of pistils into stamens in Chives (_Allium Scorodoprasum_), and in which three stamens appeared in the place of as many pistils, and had extrorse anthers, while the six normal anthers are introrse.”
“The anthers are at first introrse, but just before the bud opens they assume this position [sketch] and then turn right over and become extrorse.”
These user-created lists contain the word ‘extrorse’.
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Looking for tweets for extrorse.