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A detached body of troops serving to guard an army from surprise, and to oppose reconnoitering parties of the enemy; -- called also outlying picket.

A gauge connected with a water main to show the pressure at that point.

oring matter, as the pigmented epithelial cells of the choroid and iris, or the pigmented connective tissue cells in the skin of fishes, reptiles, etc.

bridge of which the roadway is supported on piles. -- Pile cap, a beam resting upon and connecting the heads of piles. -- Pile driver, or Pile engine, an apparatus for driving down piles, consisting usually of a high frame, with suitable appliances for raising to a height (by animal or steam power, the explosion of…

piles; piles considered collectively; as, the piling of a bridge. Pug piling, sheet piles connected together at the edges by dovetailed tongues and grooves. -- Sheet piling, a series of piles made of planks or half logs driven edge to edge, -- used to form the walls of cofferdams, etc.

vertebrate brain; -- called also pineal body, epiphysis, conarium. In some animals it is connected with a rudimentary eye, the so-called pineal eye, and in other animals it is supposed to be the remnant of a dorsal median eye.

r a building. -- Pipe fitting, a piece, as a coupling, an elbow, a valve, etc., used for connecting lengths of pipe or as accessory to a pipe. -- Pipe office, an ancient office in the Court of Exchequer, in which the clerk of the pipe made out leases of crown lands, accounts of cheriffs, etc. [Eng.] -- Pipe tree (Bot…

unicates motion. -- Piston valve (Steam Eng.), a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve.

The connecting rod in a sawmill; also, sometimes, a connecting rod in other machinery.

gland (Anat.), a glandlike body of unknown function, situated in the pituitary fossa, and connected with the infundibulum of the brain; the hypophysis. -- Pituitary fossa (Anat.), the ephippium.

The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth.

n original settlement in a new country; a colony. While these plantations were forming in Connecticut. B. Trumbull.

Of, pertaining to, or connected with, plasma; plasmatic.

The closed sac formed by the pleural membrane about each lung, or the fold of membrane connecting each lung with the body wall.

A combining form denoting relation to a side; specif., connection with, or situation in or near, the pleura; as, pleuroperitoneum.

A switchboard in which connections are made by means of plugs.

A switch made up of a rail from each track, both rails being tapered far back and connected to throw alongside the through rail of either track.

coexistence, in the same locality, of two or more distinct forms independent of sex, not connected by intermediate gradations, but produced from common parents.

An expression composed of two or more terms, connected by the signs plus or minus; as, a2 - 2ab + b2.

A bridge; -- applied to several parts which connect others, but especially to the pons Varolii, a prominent band of nervous tissue situated on the ventral side of the medulla oblongata and connected at each side with the hemispheres of the cerebellum; the mesocephalon. See Brain. Pons asinorum. Etym: [L., literally, br…