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A prefix, signifying twofold, double, twice; (Chem.)

efix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.

Combining forms from L. pes, pedis, foot, as pedipalp, pedireme, pedometer.

A kind of Venetian glass or glassware in which white threads are embedded in transparent glass with a lacelike or netlike effect.

tituent is present in double the ordinary proportion; as, bichromate, bisulphide. Be- and di- are often used interchangeably.

d not to its composition, but which is now generally employed in the same sense as bi- or di-, although little used.

A prefix from the Latin, whence F. dés, or sometimes dé-, dis-. The Latin dis- appears as di- before b, d, g, l, m, n, r, v, becomes dif- before f, and either dis- or di- before j. It is from the same root as bis twice, and duo, E. two. See Two, and cf. Bi-, Di-, Dia-. Dis- denotes separation, a parting from, as in dis…

the other ingredients; as in calcium superphosphate. It has been superseded by per-, bi-, di-, acid, etc. (as peroxide, bicarbonate, disulphide, and acid sulphate), which retain the old meanings of super-, but with sharper definition. Cf. Acid, a., Bi-, Di-, and Per-.