RESIDUAL Re*sid"u*al, n. (Math.) (a) The difference of the results obtained by observation, and by computation from a formula. (b) The difference between the mean of several observations and any one of them.

RESIDUARY
Re*sid"u*a*ry (—r), a. Etym: [See Residue.]

Defn: Consisting of residue; as, residuary matter; pertaining to the residue, or part remaining; as, the residuary advantage of an estate. Ayliffe. Residuary clause (Law), that part of the testator's will in which the residue of his estate is disposed of. — Residuary devise (Law), the person to whom the residue of real estate is devised by a will. — Residuary legatee (Law), the person to whom the residue of personal estate is bequeathed.

RESIDUE
Res"i*due (rz"-d), n. Etym: [F. résidu, L. residuum, fr. residuus
that is left behind, remaining, fr. residere to remain behind. See
Reside, and cf. Residuum.]

1. That which remains after a part is taken, separated, removed, or designated; remnant; remainder. The residue of them will I deliver to the sword. Jer. xv. 9. If church power had then prevailed over its victims, not a residue of English liberty would have been saved. I. Taylor.

2. (Law)

Defn: That part of a testeator's estate wwhich is not disposed of in his will by particular and special legacies and devises, and which remains after payment of debts and legacies.

3. (Chem.)

Defn: That which remains of a molecule after the removal of a portion of its constituents; hence, an atom or group regarded as a portion of a molecule; — used as nearly equivalent to radical, but in a more general sense.

Note: The term radical is sometimes restricted to groups containing carbon, the term residue being applied to the others.