{ } a. [ Cf. F. supplémentaire. ] Added to supply what is wanted; additional; being, or serving as, a supplement; as, a supplemental law; a supplementary sheet or volume. [ 1913 Webster ]

Supplemental air (Physiol.), the air which in addition to the residual air remains in the lungs after ordinary expiration, but which, unlike the residual air, can be expelled; reserve air. --
Supplemental bill (Equity), a bill filed in aid of an original bill to supply some deffect in the latter, or to set forth new facts which can not be done by amendment. Burrill. Daniel. --
Supplementary chords (Math.), in an ellipse or hyperbola, any two chords drawn through the extremities of a diameter, and intersecting on the curve. [ 1913 Webster ]