- contraction ring
- see constriction r. and retraction r.
Medical dictionary. 2011.
contraction ring
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Ring expansion reaction — A ring expansion reaction is a type of organic reaction in which usually a hydrocarbon ring is expanded. Examples of ring expansions are: * Beckmann rearrangement * Dowd Beckwith ring expansion reaction. Ring contraction reaction A ring… … Wikipedia
ring — 1. A circular band surrounding a wide central opening; a r. shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or… … Medical dictionary
constriction ring dystocia — contraction ring dystocia dystocia caused by contraction of an area of circular muscle fibers, which may occur at various levels of the parturient uterus … Medical dictionary
ring shake — noun : a defect in timber consisting of shrinkage and separation of the annual rings called also cup shake; compare heart shake * * * ring shake, a crack in timber, usually caused by frost, in which the extremes of contraction and expansion tear… … Useful english dictionary
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Extension and contraction of ideals — In commutative algebra, the extension and contraction of ideals are operations performed on sets of ideals. Extension of an ideal Let A and B be two commutative rings with unity, and let f : A → B be a (unital) ring homomorphism. If mathfrak{a}… … Wikipedia
Cramp ring — Cramp Cramp (kr[a^]mp), n. [OE. crampe, craumpe; akin to D. & Sw. kramp, Dan. krampe, G. krampf (whence F. crampe), Icel. krappr strait, narrow, and to E. crimp, crumple; cf. cram. See {Grape}.] 1. That which confines or contracts; a restraint; a … The Collaborative International Dictionary of English
Gin ring — Gin Gin, n. [A contraction of engine.] [1913 Webster] 1. Contrivance; artifice; a trap; a snare. Chaucer. Spenser. [1913 Webster] 2. (a) A machine for raising or moving heavy weights, consisting of a tripod formed of poles united at the top, with … The Collaborative International Dictionary of English
constriction ring — The equatorial ring of microfilaments that diminishes in diameter probably both by contraction and disassembly as cytokinesis proceeds … Dictionary of molecular biology
Cannon ring — in the radiograph after a barium meal, a narrow area or focal contraction at the middle third of the transverse colon, representing the junction of the primitive midgut and hindgut and marking an area of overlap between the superior and inferior… … Medical dictionary
