The Collaborative International Dictionary of English v.0.48:

Extrorse \Ex*trorse"\, a. [As if from an assumed L. extrorsus,
   for extroversus; extra on the outside + vertere, versum, to
   turn: cf. F. extrorse.] (Bot.)
   Facing outwards, or away from the axis of growth; -- said
   esp. of anthers occupying the outer side of the filament.
   [1913 Webster]