a category for classifying a star, as A star or G star, according to features of its spectrum, as its shape as a function of temperature and wavelength and its absorption spectrum, that indicate the surface temperature of the star and the presence of particular atoms or molecules in its outer layers: principal types are spectral types O, B, A, F, G, K, and M.
any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperature
A classification system for stars based on the strength of their spectral lines, using the letters O, B, A, F, G, K, M, L, and T to denote a range from blue (as in blue giant stars) to dim red (as in brown dwarfs). The spectrum of a star correlates with its surface temperature, ranging from over 60,000°K (O type) to less than 3,500°K (L and T types). See also Hertzsprung-Russell diagram.
noun 1. a vivid yellow color.
noun, Chiefly British. 1. specter. noun 1. a visible incorporeal spirit, especially one of a terrifying nature; ghost; phantom; apparition. 2. some object or source of terror or dread: the specter of disease or famine. noun 1. a ghost; phantom; apparition 2. a mental image of something unpleasant or menacing: the spectre of redundancy
noun, Biochemistry. 1. a rodlike structural protein of the red blood cell membrane. noun 1. any one of a class of fibrous proteins found in the membranes of red blood cells, the brain, the intestine, etc spectrin spec·trin (spěk’trĭn) n. A contractile protein of high molecular weight that is a component of a network in […]
1. a combining form representing spectrum, in compound words: spectrometer. combining form 1. indicating a spectrum: spectrogram spectro- pref. Spectrum: spectroscope.