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letter S, or the Greek s. Sigmoid flexure (Anat.), the last curve of the colon before it terminates in the rectum. See Illust. under Digestive. -- Sigmoid valves. (Anat.) See Semilunar valves, under Semilunar.

Existing by itself; single; individual. The idea which represents one . . . determinate thing, is called a singular idea, whether simple, complex, or compound. I. Watts.

A division of Scaphopoda including those in which the foot terminates in a circular disk.

pecies of large, flat elasmobranch fishes of the genus Raia, having a long, slender tail, terminated by a small caudal fin. The pectoral fins, which are large and broad and united to the sides of the body and head, give a somewhat rhombic form to these fishes. The skin is more or less spinose.

A tenure of lands and tenements by a certain or determinate service; a tenure distinct from chivalry or knight's service, in which the obligations were uncertain. The service must be certain, in order to be denominated socage, as to hold by fealty and twenty shillings rent. [Written also soccage.]

A person unknown or uncertain; a person indeterminate; some person. Jesus said, Somebody hath touched me. Luke viii. 46. We must draw in somebody that may stand "Twixt us and danger." Denham.

unknown, undetermined, or not specifically designated; a certain indefinite thing; an indeterminate or unknown event; an unspecified task, work, or thing. There is something in the wind. Shak. The whole world has something to do, something to talk of, something to wish for, and something to be employed about. Pope. Som…

To some indeterminate place; to some place or other. Driven by the winds of temptation somewhither. Barrow.

r species of the same genus. -- Specific disease (Med.) (a) A disease which produces a determinate definite effect upon the blood and tissues or upon some special tissue. (b) A disease which is itself uniformly produced by a definite and peculiar poison or organism. -- Specific duty. (Com.) See under Duty. -- Specif…

genus Acanthylis, or Chætura, and allied genera, in which the shafts of the tail feathers terminate in rigid spines.

, that as the index moves in any manner in a plane the first point or stigma moves in a determinate way in the same plane.

-- Sucker tube (Zoöl.), one of the external ambulacral tubes of an echinoderm, -- usually terminated by a sucker and used for locomotion. Called also sucker foot. See Spatangoid.

That part of the side which is terminated by the flank prolonged, and the angle of the nearest bastion. Stocqueler. Caustic surface, Heating surface, etc. See under Caustic, Heating, etc. -- Surface condensation, Surface condenser. See under Condensation, and Condenser. -- Surface gauge (Mach.), an instrument consist…

gent of an arc, a right line, as ta, touching the arc of a circle at one extremity a, and terminated by a line ct, passing from the center through the other extremity o.

Capable of being terminated or bounded; limitable. -- Ter"mi*na*ble*ness, n. Terminable annuity, an annuity for a stated, definite number of years; -- distinguished from life annuity, and perpetual annuity.

That which terminates or ends; termination; extremity.

Tending or serving to terminate; terminating; determining; definitive. Bp. Rust. -- Ter"mi*na*tive*ly, adv. Jer. Taylor.

One who, or that which, terminates.

To terminate. [Obs.] Bp. Hall.

A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.