SOLUBLES

Noun

solubles pl (plural only)

Liquid, containing dissolved and dispersed solids, that is a byproduct of alcoholic fermentation, and is used as a source of dietary protein.

Source: Wiktionary

SOLUBLE

Sol"u*ble, a. Etym: [L. solubilis, fr. solvere, solutum, to loosen, to dissolve: cf. F. soluble. See Solve, and cf. Solvable.]

1. Susceptible of being dissolved in a fluid; capable of solution; as, some substances are soluble in alcohol which are not soluble in water. Sugar is . . . soluble in water and fusible in fire. Arbuthnot.

2. Susceptible of being solved; as, a soluble algebraic problem; susceptible of being disentangled, unraveled, or explained; as, the mystery is perhaps soluble. "More soluble is this knot." Tennyson.

3. Relaxed; open or readily opened. [R.] "The bowels must be kept soluble." Dunglison. Soluble glass. (Chem.) See under Glass.

Source: Webster’s Unabridged Dictionary 1913 Edition