Part 358

Arithmetic of sines, trigonometry. -- Political arithmetic, the application of the science of numbers to problems in civil government, political economy, and social science. -- Universal arithmetic, the name given by Sir Isaac Newton to algebra.

Ar`ith*met"ic*al (&?;), a. Of or pertaining to arithmetic; according to the rules or method of arithmetic.

Arithmetical complement of a logarithm. See Logarithm. -- Arithmetical mean. See Mean. -- Arithmetical progression. See Progression. -- Arithmetical proportion. See Proportion.

Ar`ith*met"ic*al*ly, adv. Conformably to the principles or methods of arithmetic.

A*rith`me*ti"cian (&?;), n. [Cf. F. arithméticien.] One skilled in arithmetic.

A*rith"mo*man"cy (&?;), n. Arithmancy.

Ar`ith*mom"e*ter (&?;), n. [Gr. &?; number + -meter: cf. F. arithmomètre.] A calculating machine.

Ark (&?;), n. [OE. ark, arke, arche, AS. arc, earc, earce, fr. L. arca, fr. arcere to inclose, keep off; akin to Gr. &?; to keep off.] 1. A chest, or coffer. [Obs.]

Bearing that precious relic in an ark. Spenser.

2. (Jewish Hist.) The oblong chest of acacia wood, overlaid with gold, which supported the mercy seat with its golden cherubs, and occupied the most sacred place in the sanctuary. In it Moses placed the two tables of stone containing the ten commandments. Called also the Ark of the Covenant.

3. The large, chestlike vessel in which Noah and his family were preserved during the Deluge. Gen. vi. Hence: Any place of refuge.

4. A large flatboat used on Western American rivers to transport produce to market.

Ark"ite (&?;), a. Belonging to the ark. [R.] Faber.

Ark" shell` (&?;). (Zoöl.) A marine bivalve shell belonging to the genus Arca and its allies.

Arles (&?;), n. pl. [Cf. F. arrhes, Scot. airles. Cf. Earles penny.] An earnest; earnest money; money paid to bind a bargain. [Scot.]

Arles penny, earnest money given to servants. Kersey.

Arm (&?;), n. [AS. arm, earm; akin to OHG. aram, G., D., Dan., & Sw. arm, Icel. armr, Goth. arms, L. armus arm, shoulder, and prob. to Gr. &?; joining, joint, shoulder, fr. the root &?; to join, to fit together; cf. Slav. rame. &?;. See Art, Article.] 1. The limb of the human body which extends from the shoulder to the hand; also, the corresponding limb of a monkey.

2. Anything resembling an arm; as, (a) The fore limb of an animal, as of a bear. (b) A limb, or locomotive or prehensile organ, of an invertebrate animal. (c) A branch of a tree. (d) A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard. (e) (Naut) The end of a yard; also, the part of an anchor which ends in the fluke. (f) An inlet of water from the sea. (g) A support for the elbow, at the side of a chair, the end of a sofa, etc.

3. Fig.: Power; might; strength; support; as, the secular arm; the arm of the law.

To whom is the arm of the Lord revealed? Isa. lii. 1.

Arm's end, the end of the arm; a good distance off. Dryden. -- Arm's length, the length of the arm. -- Arm's reach, reach of the arm; the distance the arm can reach. -- To go (or walk) arm in arm, to go with the arm or hand of one linked in the arm of another. "When arm in armwe went along." Tennyson. -- To keep at arm's length, to keep at a distance (literally or figuratively); not to allow to come into close contact or familiar intercourse. -- To work at arm's length, to work disadvantageously.

Arm, n. [See Arms.] (Mil.) (a) A branch of the military service; as, the cavalry arm was made efficient. (b) A weapon of offense or defense; an instrument of warfare; -- commonly in the pl.

Arm, v. t. [imp. & p. p. Armed (&?;); p. pr. & vb. n. Arming.] [OE. armen, F. armer, fr. L. armare, fr. arma, pl., arms. See arms.] 1. To take by the arm; to take up in one's arms. [Obs.]

And make him with our pikes and partisans A grave: come, arm him. Shak.

Arm your prize; I know you will not lose him. Two N. Kins.

2. To furnish with arms or limbs. [R.]

His shoulders broad and strong, Armed long and round. Beau. & Fl.

3. To furnish or equip with weapons of offense or defense; as, to arm soldiers; to arm the country.