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Of or pertaining to the biquadrate, or fourth power. Biquadratic equation (Alg.), an equation of the fourth degree, or an equation in some term of which the unknown quantity is raised to the fourth power. -- Biquadratic root of a number, the square root of the square root of that number. Thus the square root of 81 is…

To bring into a square. [R.] Ash.

A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale.

Of, pertaining to, or representing the pterygoid and quadrate bones or cartilages.

An aspect of the planets when distant from each other the half of a quadrant, or forty-five degrees, or one sign and a half. Hutton.

Nearly or approximately square; almost square.

Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles.

as, an adroit mechanic, an adroit reply. "Adroit in the application of the telescope and quadrant." Horsley. "He was adroit in intrigue." Macaulay.

The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument Whewell.

An instrument for taking altitudes, as a quadrant, sextant, etc. Knight.

A modification of the quadrant, for measuring small angles. [Obs.]

hape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.

The quadrant of an azimuth circle.

t formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.

lank line (Print.), a vacant space of the breadth of a line, on a printed page; a line of quadrats. -- Blank tire (Mech.), a tire without a flange. -- Blank tooling. See Blind tooling, under Blind. -- Blank verse. See under Verse. -- Blank wall, a wall in which there is no opening; a dead wall.

rms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B.

A rude sort of quadrant formerly used for taking the sun's altitude at sea.

to call a new legislature, to closet its members. Bancroft. He had been closeted with De Quadra. Froude.

at phase of the moon in which it appears bisected, or shows only half its disk, as at the quadratures.

s or sets of quantities, the sign = being placed between them; as, a binomial equation; a quadratic equation; an algebraic equation; a transcendental equation; an exponential equation; a logarithmic equation; a differential equation, etc.