protrusive

from WordNet (r) 3.0 (2006)

protrusive
    adj 1: thrusting outward [ant: {intrusive}]

from The Collaborative International Dictionary of English v.0.48

Protrusive \Pro*tru"sive\, a.
   1. Thrusting or impelling forward; as, protrusive motion.
      --E. Darwin.
      [1913 Webster]

   2. Capable of being protruded; protrusile.
      [1913 Webster]