| polyatomic | <chemistry> Having more than one atom in the molecule; consisting of several atoms. Having a valence greater than one. Origin: Poly- + atomic. Source: Websters Dictionary (01 Mar 1998) |
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| polyautography | The act or practice of multiplying copies of one's own handwriting, or of manuscripts, by printing from stone, a species of lithography. Origin: Poly- + autography. Source: Websters Dictionary (01 Mar 1998) |
| polyauxotroph | A mutant organism that requires several nutrients that are not required by the wild type organism. Compare: auxotroph, monoauxotroph. (05 Mar 2000) |
| polyavitaminosis | Avitaminosis with multiple deficiencies. (05 Mar 2000) |
| polyaxial joint | One in which movement occurs in a number of axes. See: ball-and-socket joint. Synonym: polyaxial joint. (05 Mar 2000) |
| polybasic | <chemistry> Capable of neutralising, or of combining with, several molecules of a monacid base; having several hydrogen atoms capable of being replaced by basic radicals; said of certain acids; as, sulphuric acid is polybasic. Origin: Poly- + basic. Source: Websters Dictionary (01 Mar 1998) |
| polybasic acid | An acid containing more than three ionizable atoms of hydrogen in the molecule. (05 Mar 2000) |
| polybasite | <chemical> An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic. See: Polybasic. Source: Websters Dictionary (01 Mar 1998) |
| polyblast | One of a group of ameboid, mononucleated, wandering phagocytic cells found in inflammatory exudates. Origin: poly-+ G. Blastos, germ (05 Mar 2000) |
| polyblennia | Excessive production of mucus. Origin: poly-+ G. Blennos, mucus (05 Mar 2000) |
| polybranchia | <zoology> A division of Nudibranchiata including those which have numerous branchiae on the back. Origin: NL. See Poly-, and Branchia. Source: Websters Dictionary (01 Mar 1998) |
| polybromide | <chemistry> A bromide containing more than one atom of bromine in the molecule. Origin: Poly- + bromide. Source: Websters Dictionary (01 Mar 1998) |
| polybrominated biphenyls | Biphenyl compounds which are extensively brominated. Many of these compounds are toxic environmental pollutants. (12 Dec 1998) |
| polycarbophil | A polyacrylic acid cross-linked with divinyl glycol; used as a gastrointestinal absorbent. (05 Mar 2000) |
| polycarboxylate cement | Water-soluble low-molecular-weight polymers of acrylic or methacrylic acid that form solid, insoluble products when mixed with specially prepared zno powder. The resulting cement adheres to dental enamel and is also used as a luting agent. (12 Dec 1998) |