com·ple·men·tal /ˌkɑmpləˈmɛntḷ/
  (a.)補足的,補充的
  complemental
  互補
  complemental
  互補
  Com·ple·men·tal a.
  1. Supplying, or tending to supply, a deficiency; fully completing. “Complemental ceremony.”
  2. Complimentary; courteous. [Obs.]
  Complemental air Physiol., the air (averaging 100 cubic inches) which can be drawn into the lungs in addition to the tidal air, by the deepest possible inspiration.
  Complemental males Zool., peculiar small males living parasitically on the ordinary hermaphrodite individuals of certain barnacles.
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  complemental
       adj : acting as or providing a complement (something that
             completes the whole) [syn: complementary, completing]