extrorse

American  

[ek-strawrs, ek-strawrs] / ɛkˈstrɔrs, ˈɛk strɔrs /

adjective

Botany.

1. turned or facing outward, as anthers that open toward the perianth.

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extrorse British  

/ ɛkˈstrɔːs /

adjective

1. botany turned or opening outwards or away from the axis

   extrorse anthers

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extrorse Scientific  

/ ĕk′strôrs′ /

1. Facing outward, away from the central axis around which a flower is arranged. Used of anthers and the direction in which they open to release pollen.

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Other Word Forms

• extrorsely adverb

Etymology

Origin of extrorse

1855–60; < Late Latin extrorsus in outward direction, equivalent to extr ( a )- extra- + ( v ) orsus (adv.) turned

Example Sentences

Stamens 4, opposite the sepals, with at length rather slender filaments; anthers extrorse, 2-celled, opening lengthwise.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa

Stamens much shorter, barely adherent to their base; anthers linear, much longer than the filaments, adnate and extrorse, but the long narrow cells opening laterally.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa

Anthers heart-shaped or kidney-shaped, confluently 1-celled, shield-shaped after opening, extrorse.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa

Sometimes, from their versatile nature, anthers originally introrse become extrorse, as in the Passion-flower and Oxalis.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various

Extrorse, turned outwards; the anther is extrorse when fastened to the filament on the side next the pistil, and opening on the outer side, 101.

From The Elements of Botany For Beginners and For Schools by Gray, Asa