ortho salts

pl. Chem.: The prefixes ortho- and meta- were introduced by Odling to denote two cla es of salts of the same acid, which differ from one another by one or more molecules of metallic oxide, M2O, MO, ., the more basic salts being called ortho-, and the le basic, meta-salts; thus: ortho-carbonate of ethyl, (C2H5)4CO4; meta-carbonate of ethyl, (C2H5)2CO3. or-thoç-er-a, or-thoç-er-ā-ta, s. pl. [ORTHO CERAS.] Palæont.: The same as ORTHOCERATIDE (q. v.). or-thoç'-er-ăs, s. [Pref. ortho- , and Gr. keras = a horn, the chambered shell resembling a straight horn.] Pulœont.: The typical genus of the Orthoceratide (q.v.). The shell straight, siphuncle central, aperture sometimes contracted. Known species 240; from the Silurian to the Lias. Distribution North America, Australia, and Europe.