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Having a cross section in the form of an equilateral triangle; -- said especially of a kind of file.

Any system of rudders by which the pilot can exert a turning moment about each of the three rectangular axes of an aëroplane or airship.

Consisting of, or having, three valves; opening with three valves; as, a three-valved pericarp.

Connected with, or serving to connect, three channels or pipes; as, a three-way cock or valve.

Consisting of three, or thrice repeated; triple; as, threefold justice. A threefold cord is not quickly broken. Eccl. iv. 12.

A small silver coin of three times the value of a penny. [Eng.]

Costing or worth three pence; hence, worth but little; poor; mean.

Formerly, the head officer of a lathe. See 1st Lathe.

The first three letters of the alphabet, used for the whole alphabet.

about as cold; about as high; -- also of quantity, number, time. "There fell . . . about three thousand men." Exod. xxii. 28.

In a plane, the two imaginary circular points at infinity; in space of three dimensions, the imaginary circle at infinity.

at of the sun, in consequence of which they daily come to the meridian of any place about three minutes fifty-six seconds of solar time earlier than on the day preceding. -- Acceleration of the planets, the increasing velocity of their motion, in proceeding from the apogee to the perigee of their orbits.…

es rapacious birds. They have a hooked bill, and sharp, strongly curved talons. There are three families, represented by the vultures, the falcons or hawks, and the owls.

A volatile liquid consisting of three parts of carbon, six of hydrogen, and one of oxygen; pyroacetic spirit, -- obtained by the distillation of certain acetates, or by the destructive distillation of citric acid, starch, sugar, or gum, with quicklime.

A complex, hypothetical radical, composed of two parts of carbon to three of hydrogen and one of oxygen. Its hydroxide is acetic acid.

and to adjective also the mood, as it has to adjective time. It has . . . adjectived all three. Tooke.

To beautify; to dandify. I employed three good hours at least in adjusting and adonozing myself. Smollett.

Later in time; subsequent; as, after supper, after three days. It often precedes a clause. Formerly that was interposed between it and the clause. After I am risen again, I will go before you into Galilee. Matt. xxvi. 32.

in some age or other, will find her witness. Milton. Archeological ages are designated as three: The Stone age (the early and the later stone age, called paleolithic and neolithic), the Bronze age, and the Iron age. During the Age of Stone man is supposed to have employed stone for weapons and implements. See Augustan,…

Ago. [Archaic. & Poet.] Three days agone I fell sick. 1 Sam. xxx. 13.