Source : Webster's Revised Unabridged Dictionary (1913)

Antrorse \An*trorse"\ ([a^]n*tr[^o]rs"), a. [From L. ante +
   versun turned; apparently formed in imitation of retrorse.]
   (Bot.)
   Forward or upward in direction. --Gray.

Source : WordNet®

antrorse
     adj : bent or curved forward or upward; "a plant having antrorse
           hairs on the stem" [ant: {retrorse}]