n. [ Gr. 'a`mfw both: cf. F. amphide. ] (Chem.) A salt of the class formed by the combination of an acid and a base, or by the union of two oxides, two sulphides, selenides, or tellurides, as distinguished from a haloid compound. [ R. ] Berzelius. [ 1913 Webster ]

n. [ Gr. 'amfi` + di`skos a round plate. ] (Zool.) A peculiar small siliceous spicule having a denticulated wheel at each end; -- found in freshwater sponges. [ 1913 Webster ]

a. [ Gr. 'amfi`dromos running about or around. ] Pertaining to an Attic festival at the naming of a child; -- so called because the friends of the parents carried the child around the hearth and then named it. [ 1913 Webster ]