\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} (Zo["o]l.), peculiar small males living
   parasitically on the ordinary hermaphrodite individuals of
   certain barnacles.