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line ad is perpendicular to the line bc. Perpendicular style (Arch.), a name given to the latest variety of English Gothic architecture, which prevailed from the close of the 14th century to the early part of the 16th; -- probably so called from the vertical style of its window mullions.

l*ly, adv. Pharmaceutical chemistry, that department of chemistry which ascertains or regulates the composition of medicinal substances.

The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.

An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

That branch of science which relates to the mind; mental philosophy. [R.]

athus, and allied genera, having a long and very slender angular body, covered with bony plates. The mouth is small, at the end of a long, tubular snout. The male has a pouch on his belly, in which the incubation of the eggs takes place.

The distance between the centers of holes, as of rivet holes in boiler plates. Concert pitch (Mus.), the standard of pitch used by orchestras, as in concerts, etc. -- Diametral pitch (Gearing), the distance which bears the same relation to the pitch proper, or circular pitch, that the diameter of a circle bears to its…

group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.

A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.

vision of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.

A European food fish (Pleuronectes platessa), allied to the flounder, and growing to the weight of eight or ten pounds or more.

, albuminous fluid contained within the sarcolemma, which on the death of the muscle coagulates to a semisolid mass.

A piece of money, usually silver money. [Obs.] "Realms and islands were as plates dropp'd from his pocket." Shak.

One who plates or coats articles with gold or silver; as, a silver plater.

The art or process of covering anything with a plate or plates, or with metal, particularly of overlaying a base or dull metal with a thin plate of precious or bright metal, as by mechanical means or by electro-magnetic deposition.

To flatten and make into sheets or plates; as, to platten cylinder glass.

Like a plate; consisting of plates.

ating motion; to operate; to act; as, the fountain plays. The heart beats, the blood circulates, the lungs play. Cheyne.