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pericardium the bag made of membrane that surrounds the heart perimeter the outside edge of any closed plane figure or area; the length of the boundary of such a figure or area periodically at regular intervals; from time to time periodontal of the gums or other tissues surrounding the teeth periotic surrounding the inner ear, specifically of the bony structure forming a capsule enclosing the semicircular canal peripatetic wandering from place to place peripheral relating to, situated in, or forming the outside boundary or surface of something; merely incidental periscope an instrument, consisting of mirrors and a tube, that allows the viewer to see things above or otherwise out of sight perigee 1:the point in the orbit of an object (as a satellite) orbiting the earth that is nearest to the center of the earth 2:the point nearest a planet or a satellite (as the moon) reached by an object orbiting periodic law a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties peripheral vision all that is visible to the eye outside the central area of focus; side vision peristalsis successive waves of involuntary contraction passing along the walls of a hollow muscular structure (as the esophagus or intestine) and forcing the contents onward peripeteia a sudden or unexpected reversal of circumstances or situation especially in a literary work periphrasis use of a longer phrasing in place of a possible shorter form of expression peri- around