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pericranium the external periosteum covering the outer surface of the skull.
perigee in astronomy, the point in the orbit of a moon or other satellite at which it is closest to the earth. (Cf. apogee.)
perigynous of sepals, petals, and stamens, attached to the edges of a cuplike structure that surrounds the ovary but is not connected to it. (Cf. epigynous, hypogynous.)
perihelion the point in the orbit of a planet or other body at which it comes closest to the sun. (Cf. aphelion.)
peril the condition of being in danger; jeopardy; risk. [3 definitions]
perilous causing or involving great danger; risky; hazardous.
perimeter the boundary or border of a closed, two-dimensional figure or area. [2 definitions]
perineum the area of the body between the thighs, esp. the area between the anus and the vulva in the female and the anus and the scrotum in the male.
period a specific, limited interval or span of time. [8 definitions]
periodic recurring or reappearing at regular intervals of time. [3 definitions]
periodical a publication composed of issues that appear at regular intervals. [3 definitions]
periodicity the tendency to recur at regular intervals. [2 definitions]
periodic law the principle that the properties of the chemical elements recur periodically when the elements are arranged in increasing order of their atomic numbers.
periodic system a system of classifying the chemical elements, based on the periodic law.
periodic table a table that illustrates the periodic system of the chemical elements, classified according to atomic number.
periodization the dividing of history into chronological periods.
periodontal of or relating to the tissue, bones, and gums that surround and support the teeth.
periodontics (used with a sing. verb) the branch of dentistry concerned with diseases and treatment of the gums, bones, and tissues surrounding the teeth.
periosteum a tough, fibrous membrane that covers all bones except at the joints.
peripatetic walking or traveling around; going from place to place; itinerant. [2 definitions]
peripheral of, relating to, or forming a periphery. [3 definitions]