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A central cord of the ovary of nematodes.

An order of reptiles having biconcave vertebræ, immovable quadrate bones, and many other peculiar osteological characters. Hatteria is the only living genus, but numerous fossil genera are known, some of which are among the earliest of reptiles. See Hatteria. Called also Rhynchocephalia.

erring upon a chief executive, as a governor or mayor, large powers of appointment and removal of heads of departments or other subordinate officials. [Polit. Cant, U. S.]

Hence, to fasten firmly; to make firm, strong, or immovable; as, to rivet friendship or affection. Rivet and nail me where I stand, ye powers! Congreve. Thus his confidence was riveted and confirmed. Sir W. Scott.

The ova or spawn of fishes and amphibians, especially when still inclosed in the ovarian membranes. Sometimes applied, loosely, to the sperm and the testes of the male.

So named from its first describer, J. C. Rosenmüller, a German anatomist.] (Anat.) The parovarium.

The movable piece to which the ribs of an umbrella are attached.

An officer of the church who has the care of the utensils or movables, and of the church in general; a sexton.

A strong and fireproof receptacle (as a movable chest of steel, etc., or a closet or vault of brickwork) for money, valuable papers, or the like.

upporting a beam of the keelson, and supporting a beam of the deck; also, a temporary or movable pilar carrying a leading block or pulley for various purposes. Brande & C. (b) In deepwell boring, the post which supports the walking beam of the apparatus.

of the genus Hyalinæcia, especially H. tubicola of Europe, which inhabits a transparent movable tube resembling a quill in color and texture.

The man who manages the movable scenes in a theater.

nstrument resembling shears, but smaller, consisting of two cutting blades with handles, movable on a pin in the center, by which they are held together. Often called a pair of scissors. [Formerly written also cisors, cizars, and scissars.] Scissors grinder (Zoöl.), the European goatsucker. [Prov. Eng.]…

Hence, to prepare by drying or hardening, or removal of natural juices; as, to season timber.

er plants and animals are derived from the germ cell. In the simplest case, that of small ova destitute of food yolk, the ovum or egg divides into two similar halves or segments (blastomeres), each of these again divides into two, and so on, thus giving rise to a mass of cells (mulberry mass, or morula), all equal and…

he clot formed in the coagulation of the blood; the loquid portion of the blood, after removal of the blood corpuscles and the fibrin. -- Muscle serum, the thin watery fluid which separates from the muscles after coagulation of the muscle plasma; the watery portion of the plasma. See Muscle plasma, under Plasma. -- S…

ndicum, and S. orientale), from the seeds of which an oil is expressed; also, the small obovate, flattish seeds of these plants, sometimes used as food. See Benne. Open Sesame, the magical command which opened the door of the robber's den in the Arabian Nights' tale of "The Forty Thieves;" hence, a magical password. -…

Fixed in position; immovable; rigid; as, a set line; a set countenance.

One of the movable chitinous spines or hooks of an annelid. They usually arise in clusters from muscular capsules, and are used in locomotion and for defense. They are very diverse in form.

A link or loop, as in a chain, fitted with a movable bolt, so that the parts can be separated, or the loop removed; a clevis.