a rare metallic element of the manganese subgroup: used, because of its high melting point, in platinum-rhenium thermocouples. Symbol: Re; atomic number: 75; atomic weight: 186.2.
a dense silvery-white metallic element that has a high melting point. It occurs principally in gadolinite and molybdenite and is used, alloyed with tungsten or molybdenum, in high-temperature thermocouples. Symbol: Re; atomic no: 75; atomic wt: 186.207; valency: –1 or 1–7; relative density: 21.02; melting pt: 3186°C; boiling pt: 5596°C (est)
rhenium rhe·ni·um (rē’nē-əm)
A rare dense metallic element with a high melting point. Atomic number 75; atomic weight 186.2; melting point 3,186°C; boiling point 5,596°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7.
A very rare, dense, silvery-white metallic element with a very high melting point. It is used to make catalysts and electrical contacts. Atomic number 75; atomic weight 186.2; melting point 3,180°C; boiling point 5,627°C; specific gravity 21.02; valence 1, 2, 3, 4, 5, 6, 7. See Periodic Table.
1. a combining form meaning “flow,” “current,” “stream,” used in the formation of compound words: rheoscope. combining form 1. indicating stream, flow, or current: rheometer, rheoscope rheo- pref. Current; flow: rheotaxis.
noun, Physiology. 1. the minimum electric current required to excite a given nerve or muscle. noun 1. (physiol) the minimum nerve impulse required to elicit a response from a tissue rheobase rhe·o·base (rē’ō-bās’) n. The minimal strength of an electrical stimulus that is able to cause excitation of a tissue. rhe’o·ba’sic adj.
noun 1. the study of the deformation and flow of matter. noun 1. the branch of physics concerned with the flow and change of shape of matter rheology rhe·ol·o·gy (rē-ŏl’ə-jē) n. The study of the deformation and flow of matter. rhe’o·log’i·cal (rē’ə-lŏj’ĭ-kəl) adj. rhe’o·log’i·cal·ly adv.
noun 1. an instrument for measuring the flow of fluids, especially blood. noun 1. (med) an instrument for measuring the velocity of the blood flow 2. another word for galvanometer rheometer rhe·om·e·ter (rē-ŏm’ĭ-tər) n. An instrument for measuring the flow of viscous liquids, such as blood.