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In the quaternion analysis, a quantity that has magnitude, but not direction; -- distinguished from a vector, which has both magnitude and direction.

Any one of numerous species of marine gastropods of the genus Scalaria, or family Scalaridæ, having elongated spiral turreted shells, with rounded whorls, usually crossed by ribs or varices. The color is generally white or pale. Called also ladder shell, and wentletrap. See Ptenoglossa, and Wentletrap.…

rm or appearance; having transverse bars or markings like the rounds of a ladder; as, the scalariform cells and scalariform pits in some plants.

Resembling a ladder; formed with steps. [Obs.] Sir T. Browne.

Didascalic. [R.]

Hæmatatopinus eurysternus and H. vituli are common species which suck blood; Trichodectes scalaris eats the hair. -- Cattle plague, the rinderpest; called also Russian cattle plague. -- Cattle range, or Cattle run, an open space through which cattle may run or range. [U. S.] Bartlett. -- Cattle show, an exhibition o…

sh ladder. See under Fish. -- Ladder beetle (Zoöl.), an American leaf beetle (Chrysomela scalaris). The elytra are silvery white, striped and spotted with green; the under wings are rose-colored. It feeds upon the linden tree. -- Ladder handle, an iron rail at the side of a vertical fixed ladder, to grasp with the ha…

g the whorls rising from left to right; dextral; -- said of spiral shells. See Illust. of Scalaria. Right-handed screw, a screw, the threads of which, like those of a common wood screw, wind spirally in such a direction that screw advances away from the observer when turned with a right-handed movement in a fixed nut.…

rcase is a curious piece of architecture. Sir H. Wotton. Staircase shell. (Zoöl.) (a) Any scalaria, or wentletrap. (b) Any species of Solarium, or perspective shell.

ctors are said to be equal when their directions are the same their magnitudes equal. Cf. Scalar.

Any one of numerous species of elegant, usually white, marine shells of the genus Scalaria, especially Scalaria pretiosa, which was formerly highly valued; -- called also staircase shell. See Scalaria.