01 a. Supplying, or tending to supply, a deficiency; fully completing.
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1.
Supplying, or tending to supply, a deficiency; fully completing.
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2.
Complimentary; courteous.[Obs.]
Phrases & compounds
Complemental air —
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 —
peculiar small males living parasitically on the ordinary hermaphrodite individuals of certain barnacles.