n. [ Gr. (&unr_;) concealed, p. p. of &unr_; to conceal. ] (Zool.) A genus of trilobites characteristic of the Silurian age. [ 1913 Webster ]
pos>n. (Biochemistry, Genetics) an enzyme that catalyzes the formation of DNA from deoxyribonucleoside triphosphates. Cells contain several types of DNA polymerase, some of which are required for replication of DNA, and are indispensable for multipliation and division of cells. [ PJC ]
pos>n. (Bot.) A coarse perennial grass of several species of
a. [ See Poly-, and Meniscus. ] (Zool.) Having numerous facets; -- said of the compound eyes of insects and crustaceans. [ 1913 Webster ]
n. [ See Polymeric. ] (Chem.) Any one of two or more substances related to each other by polymerism; specifically, a substance produced from another substance by chemical polymerization. [ Formerly also written polymere. ] [ 1913 Webster ]
a. [ Poly- + Gr. &unr_; part. ] (Chem.) Having the same percentage composition (that is, having the same elements united in the same proportion by weight), but different molecular weights; -- often used with with; thus, cyanic acid (
☞ The figures expressing the number of atoms of each element in a number of polymeric substances are respectively multiples and factors of each other, or have some simple common divisor. The relation may be merely a numerical one, as in the example given above, or a chemical one, as in the case of aldehyde, paraldehyde, and metaldehyde. [ 1913 Webster ]
[ 1913 Webster ]
n. (Chem.)
n. (Chem.) The act or process of changing to a polymeric form; the condition resulting from such change. [ 1913 Webster ]
v. t. (Chem.) To cause polymerization of; to produce polymers from; to increase the molecular weight of, without changing the atomic proportions; thus, certain acids polymerize aldehyde. [ 1913 Webster ]
v. i. (Chem.) To change into another substance having the same atomic proportions, but a higher molecular weight; to undergo polymerization; thus, aldehyde polymerizes in forming paraldehyde. [ 1913 Webster ]
a.
n. A supplying or furnishing; supply. [ Obs. ] Shak. [ 1913 Webster ]