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One of the secondary, and usually sexual, zooids produced by budding or fission from the primary zooids, in animals having alternate generations. In the tapeworms, the joints are deuterozooids.

cule two atoms of oxygen united with some other element or radical; -- usually called dioxide, or less frequently, binoxide.

Void; empty; vacant. [Obs.] Spenser.

Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Cf. Dibasic, a., and Biacid.

Any compound containing two amido groups united with one or more acid or negative radicals, -- as distinguished from a diamine. Cf. Amido acid, under Amido, and Acid amide, under Amide.

A prefix or combining form of Diamine.

Same as Bichloride.

ompound of a binary type containing two cyanogen groups or radicals; -- called also bicyanide.

Like or belonging to the Dicyemata. -- n.

of Do.

A treatise on teaching or education. [Obs.] Milton.

o teach; conveying instruction; preceptive; instructive; teaching some moral lesson; as, didactic essays. "Didactical writings." Jer. Taylor. The finest didactic poem in any language. Macaulay.

In a didactic manner.

The didactic method or system.

Aptitude for teaching. Hare.

The art or science of teaching.

An animal having only two digits.

Having only two digits; two-toed.

A kind of triangular spade. [Obs.]

See Dabchick.