| stop | <dentistry> A bend or auxiliary attachment placed on a wire to limit the archwire from sliding or moving in the bracket slot of the bracket. (08 Jan 1998) |
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| stop codon | <molecular biology> The three codons, UAA known as ochre, UAG as amber and UGA as opal, that do not code for an amino acid but act as signals for the termination of protein synthesis. They are not represented by any tRNA and termination is catalysed by protein release factors. There are two release factors in E. Coli, RF1 recognises UAA and UAG, RF2 recognises UAA and UGA. Eukaryotes have a single GTP requiring factor, eRF. See: ochre suppressor, amber suppressor. (13 Jan 1998) |
| stop-needle | A surgical needle, with the eye at the tip, the shank of which has a projecting shelf to arrest the needle when it has passed the desired distance through the tissues. (05 Mar 2000) |
| stop-speculum | A dilating speculum, as a speculum of the eyelids, which is provided with a catch to prevent its being opened too wide. (05 Mar 2000) |
| stope | <chemical> A horizontal working forming one of a series, the working faces of which present the appearance of a flight of steps. Origin: Cf. Step, &. <chemical> To excavate in the form of stopes. To fill in with rubbish, as a space from which the ore has been worked out. Origin: Stoped; Stoping. Source: Websters Dictionary (01 Mar 1998) |
| stoping | <chemical> The act of excavating in the form of stopes. Source: Websters Dictionary (01 Mar 1998) |
| stoppage | The act of stopping, or arresting progress, motion, or action; also, the state of being stopped; as, the stoppage of the circulation of the blood; the stoppage of commerce. Source: Websters Dictionary (01 Mar 1998) |
| stopper | 1. One who stops, closes, shuts, or hinders; that which stops or obstructs; that which closes or fills a vent or hole in a vessel. 2. A short piece of rope having a knot at one or both ends, with a lanyard under the knot, used to secure something. 3. <botany> A name to several trees of the genus Eugenia, found in Florida and the West Indies; as, the red stopper. See Eugenia. Ring stopper, a large ringbolt in a ship's deck, to which the deck stoppers are hooked. Source: Websters Dictionary (01 Mar 1998) |
| stopping | 1. Material for filling a cavity. 2. <chemical> A partition or door to direct or prevent a current of air. 3. <veterinary> A pad or poultice of dung or other material applied to a horse's hoof to keep it moist. Source: Websters Dictionary (01 Mar 1998) |
| stopping power | <radiobiology> The average rate of energy loss of a charged particle per unit thickness of a material or per unit mass of material traversed. (16 Dec 1997) |
| stopping-out | A method adopted in etching, to keep the acid from those parts which are already sufficiently corroded, by applying varnish or other covering matter with a brush, but allowing the acid to act on the other parts. Source: Websters Dictionary (01 Mar 1998) |
| stops | Bends in, or wires soldered to, an archwire to limit passage through a bracket or tube. (05 Mar 2000) |
| stopship | <zoology> A remora. It was fabled to stop ships by attaching itself to them. Source: Websters Dictionary (01 Mar 1998) |
| annular stop | <microscopy> The opaque ring-shaped stop with a small central opening usually placed in the objective back focal plane to provide dispersion staining. (05 Aug 1998) |
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| central stop | <microscopy> An opaque disk placed in the ring carrier or diaphragm carrier of the substage apparatus. It excludes the central rays and is used for dark field work at low magnification. Variable stops can be contracted or expanded as desired. (05 Aug 1998) |
| dark field stop | <microscopy> A central stop for obtaining a dark field effect for low-power objectives. It is customarily used with a high numerical aperture, bright field condenser. (05 Aug 1998) |
| quick-stop mutant | A bacterial mutant that ceases replication immediately when the temperature reaches a certain level. Compare: temperature-sensitive mutant. (05 Mar 2000) |
| Krueger instrument stop | A mechanical device limiting the insertion of a root canal instrument into a canal. (05 Mar 2000) |