The Collaborative International Dictionary of English v.0.48:

Dextral \Dex"tral\, a. [From Dexter.]
   Right, as opposed to sinistral, or left.
   [1913 Webster]

   Dextral shell (Zool.), a spiral shell the whorls of which
      turn from left right, or like the hands of a watch when
      the apex of the spire is toward the eye of the observer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

clockwise \clockwise\ adj.
   1. -- of rotatory motion. dextral
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

dextral
    adj 1: of or on the right; "a dextral gastropod shell with the
           apex upward has its opening on the right when facing the
           observer"; "a dextral flatfish lies with the right eye
           uppermost" [ant: sinistral]
    2: preferring to use right foot or hand or eye; "dextral
       individuals exhibit dominance of the right hand and eye"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "dextral":
   clockwise, conservative, dexter, dextrocardial, dextrocerebral,
   dextrocular, dextrogyrate, dextrogyratory, dextropedal,
   dextrorotary, dextrorse, off, reactionary, right, right-hand,
   right-wing, right-wingish, starboard