Part 496

4. (Lapidary Work) A counterfeit gem, composed of two pieces of crystal, with a color them, and thus giving the appearance of a naturally colored gem. Also, a piece of paste or glass covered by a veneer of real stone.

5. (Opt.) An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct. W. H. Wollaston.

6. pl. (See No. 1.) Two dice, each of which, when thrown, has the same number of spots on the face lying uppermost; as, to throw doublets.

7. pl. [Cf. Pr. doblier, dobler draughtboard.] A game somewhat like backgammon. Halliwell.

8. One of two or more words in the same language derived by different courses from the same original from; as, crypt and grot are doublets; also, guard and ward; yard and garden; abridge and abbreviate, etc.

Dou"ble*thread`ed (?), a. 1. Consisting of two threads twisted together; using two threads.

2. (Mech.) Having two screw threads instead of one; -- said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads.

Dou"ble-tongue` (?), n. Deceit; duplicity.

Now cometh the sin of double-tongue, such as speak fair before folk and wickedly behind.

Chaucer.

Dou"ble-tongued` (?), a. Making contrary declarations on the same subject; deceitful.

Likewise must the deacons be grave, not double- tongued.

1 Tim. iii. 8.

Dou"ble-tongu`ing (?), n. (Mus.) A peculiar action of the tongue by flute players in articulating staccato notes; also, the rapid repetition of notes in cornet playing.

Dou"ble*tree` (?), n. The bar, or crosspiece, of a carriage, to which the singletrees are attached.

Doub"lets (?), n. pl. See Doublet, 6 and 7.

Dou"bling (?), n. 1. The act of one that doubles; a making double; reduplication; also, that which is doubled.

2. A turning and winding; as, the doubling of a hunted hare; shift; trick; artifice. Dryden.

3. (Her.) The lining of the mantle borne about the shield or escutcheon.

4. The process of redistilling spirits, to improve the strength and flavor.

Doubling a cape, promontory, etc. (Naut.), sailing around or passing beyond a cape, promontory, etc.

Doub*loon" (?), n. [F. doublon, Sp. doblon. See Double, a., and cf. Dupion.] A Spanish gold coin, no longer issued, varying in value at different times from over fifteen dollars to about five. See Doblon in Sup.

Dou"bly (?), adv. 1. In twice the quantity; to twice the degree; as, doubly wise or good; to be doubly sensible of an obligation. Dryden.

2. Deceitfully. "A man that deals doubly." Huloet.

Doubt (?), v. i. [imp. & p. p. Dou&?;ted; p. pr. & vb. n. Doubting.] [OE. duten, douten, OF. duter, doter, douter, F. douter, fr. L. dubitare; akin to dubius doubtful. See Dubious.] 1. To waver in opinion or judgment; to be in uncertainty as to belief respecting anything; to hesitate in belief; to be undecided as to the truth of the negative or the affirmative proposition; to b e undetermined.

Even in matters divine, concerning some things, we may lawfully doubt, and suspend our judgment.

Hooker.

To try your love and make you doubt of mine.