| semisynthetic | <chemistry> Produced by chemical manipulation of naturally occurring substances. (18 Nov 1997) |
|---|---|
| semisystematic name | A name of a chemical of which at least one part is systematic and at least one part is not (i.e., is trivial). For example, calciferol includes the -ol suffix denoting an -OH radical, while calcifer-, which has no systematic meaning, is used only in this word. Cortisone contains the -one suffix, indicating a ketone group, but the rest of the term derives from cortex (adrenal). Hippuric acid (trivial) may be defined as N-benzoylglycine (semitrivial name); benzoyl is systematic for the C6H5-CO-radical, whereas glycine is the trivial name for alpha-aminoacetic (or 2-aminoethanoic, to be completely systematic) acid, and the N signifies that the benzoyl is attached to the nitrogen of glycine; from this, the structure C6H5-CO-NH-CH2-COOH is uniquely defined. Many generic or nonproprietary names of drugs, including USAN names, hormones, etc., are semitrivial in this chemical sense, although often termed trivial names; distinction between trivial and semitrivial is not often made. Synonym: semitrivial name. (05 Mar 2000) |
| semita | Origin: L, a path. <zoology> A fasciole of a spatangoid sea urchin. Source: Websters Dictionary (01 Mar 1998) |
| semitangent | <geometry> The tangent of half an arc. Source: Websters Dictionary (01 Mar 1998) |
| semitendinosus | <anatomy, muscle> Origin, ischial tuberosity; insertion, medial surface of the upper fourth of shaft of tibia; action, extends thigh, flexes leg and rotates it medially; nerve supply, tibial. Synonym: musculus semitendinosus. (05 Mar 2000) |
| semitendinous | Composed in part of tendon; denoting the semitendinosus muscle. Synonym: semitendinosus. Origin: L. Semitendinosus (05 Mar 2000) |
| semitertian | <medicine> Having the characteristics of both a tertian and a quotidian intermittent. An intermittent combining the characteristics of a tertian and a quotidian. Source: Websters Dictionary (01 Mar 1998) |
| semitic | Of or pertaining to Shem or his descendants; belonging to that division of the Caucasian race which includes the Arabs, Jews, and related races. Alternative forms: Shemitic] Semitic language, a name used to designate a group of Asiatic and African languages, some living and some dead, namely: Hebrew and Phoenician, Aramaic, Assyrian, Arabic, Ethiopic (Geez and Ampharic). Source: Websters Dictionary (01 Mar 1998) |
| semitrivial name | A name of a chemical of which at least one part is systematic and at least one part is not (i.e., is trivial). For example, calciferol includes the -ol suffix denoting an -OH radical, while calcifer-, which has no systematic meaning, is used only in this word. Cortisone contains the -one suffix, indicating a ketone group, but the rest of the term derives from cortex (adrenal). Hippuric acid (trivial) may be defined as N-benzoylglycine (semitrivial name); benzoyl is systematic for the C6H5-CO-radical, whereas glycine is the trivial name for alpha-aminoacetic (or 2-aminoethanoic, to be completely systematic) acid, and the N signifies that the benzoyl is attached to the nitrogen of glycine; from this, the structure C6H5-CO-NH-CH2-COOH is uniquely defined. Many generic or nonproprietary names of drugs, including USAN names, hormones, etc., are semitrivial in this chemical sense, although often termed trivial names; distinction between trivial and semitrivial is not often made. Synonym: semitrivial name. (05 Mar 2000) |
| semivalent | Denoting the ability to form a one-electron bond. (05 Mar 2000) |
| semivertical heart | Loosely descriptive of the heart's electrical axis when this is directed at approximately +60 |