Com`ple*men"tal (?), a.
1.
Supplying, or tending to supply, a deficiency; fully completing.
"
Complemental ceremony."
Prynne.
2.
Complimentary; courteous.
[Obs.]
Shak.
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.
© Webster 1913.