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polychaete any segmented worm of the class Polychaeta characterized by bristled appendages on each segment and usu. living in ocean water; bristle worms.
polychlorinated biphenyl see PCB.
polychrome having many or varied colors; multicolored. [4 definitions]
polyclinic a clinic or hospital that treats every kind of disease or injury.
polyconic projection a type of map on which the latitudinal lines are represented as the arcs of circles with different centers along the straight central meridian, and the other longitudinal lines are shown as curves.
polycyclic having more than one fused, ringlike structures, used esp. in reference to organic molecules.
polydipsia abnormal or excessive thirst.
polyester a synthetic resin used mainly in plastics and textiles.
polyethylene a lightweight plastic polymer of ethylene used for packaging, tubing, electrical insulation, and the like.
polygala milkwort.
polygamy the practice or state of having more than one spouse, esp. more than one wife, at a time. (Cf. monogamy.)
polygenism a theory that each human racial group is descended from entirely separate ancestors. (Cf. monogenism.)
polyglot using or knowing several languages; multilingual. [5 definitions]
polygon a closed, two-dimensional figure with three or more sides bounded by straight lines.
polygraph a device that records changes in bodily functions such as respiration rate, heartbeat, and blood pressure, sometimes used during interrogation of suspected criminals; lie detector.
polygyny the practice or state of having two or more wives at the same time.
polyhedron a solid, multifaceted figure.
polymath one who has broad knowledge or expertise in a number of distinct areas.
polymer a natural or synthetic compound, such as polyethylene or nylon, that is of high molecular weight and is composed of repeated links of simple molecules.
polymerase any of various enzymes, such as DNA polymerase and RNA polymerase, that catalyze the formation of a polynucleotide strand using an existing strand as a template.
polymeric of, pertaining to, or combined in a polymer.