[1] : The Collaborative International Dictionary of English v.0.48

centripetal \centrip"etal\, a. l. centrum center + petere to
   move toward.
   1. tending, or causing, to approach the center.
      1913 webster

   2. bot.
      a expanding first at the base of the inflorescence, and
          proceeding in order towards the summit.
      b having the radicle turned toward the axis of the
          fruit, as some embryos.
          1913 webster

   3. progressing by changes from the exterior of a thing toward
      its center; as, the centripetal calcification of a bone.
      --r. owen.
      1913 webster

   centripetal force mech., a force whose direction is
      towards a center, as in case of a planet revolving round
      the sun, the center of the system, see centrifugal
      force, under centrifugal.

   centripetal impression physiol., an impression sensory
      transmitted by an afferent nerve from the exterior of the
      body inwards, to the central organ.
      1913 webster
see also:
centripetal force centrifugal force centrifugal centripetal impression 

[2] : WordNet (r) 2.0

centripetal
     adj 1: tending to move toward a center; "centripetal force" ant: centrifugal
     2: tending to unify syn: unifyinga
     3: of a nerve fiber or impulse originating outside and passing
        toward the central nervous system; "sensory neurons" syn:
         receptive, sensorya
see also:
centrifugal unifyinga receptive sensorya 

[3] : Moby Thesaurus II by Grady Ward, 1.0

19 moby thesaurus words for "centripetal":
   approaching, asymptotic, centrolineal, concentrating, concurrent,
   confluent, confocal, connivent, consolidating, converging, focal,
   meeting, mutually approaching, radial, radiating, tangent,
   tangential, unifying, uniting

Centripetal >> C Words
Centripetal, definition of term: Centripetal
centripetal_pag1.html

Centripetal For >> C Words
Centripetal For, definition of term: Centripetal For
centripetal+for_pag1.html