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specificity the condition or quality of being specific. [2 definitions]
specify to name or otherwise indicate explicitly. [4 definitions]
specimen a portion or example that is representative of a larger whole. [2 definitions]
specious apparently true, genuine, or plausible, but actually worthless, as an argument or evidence. [2 definitions]
speck a small spot, blemish, or discoloration. [4 definitions]
speckle a speck or small mark, esp. on skin, feathers, leaves, or the like. [3 definitions]
speckled trout the brook trout, or the sea trout.
specs (informal) specifications. [2 definitions]
spectacle a visible, usu. impressive thing or action, esp. a public performance or display. [3 definitions]
spectacular of, pertaining to, or like a spectacle; impressive; marvelous. [3 definitions]
spectator one that watches or observes. [2 definitions]
specter a ghost or apparition, esp. one that causes dread or terror. [2 definitions]
spectra a pl. of spectrum.
spectral of, pertaining to, or like a specter. [2 definitions]
spectro- spectrum.
spectrogram a graphic representation or photograph of a spectrum.
spectrograph a spectroscope equipped to make a photograph or graphic representation of a spectrum.
spectroheliograph a device that is used to make photographs of the sun, using a single light from the spectrum, such as violet.
spectrometer a spectroscope equipped to measure wavelengths and the positions and angles of lines in a spectrum.
spectroscope an optical instrument that enables examination, measurement, or recording of a spectrum by rendering its component electromagnetic waves, as of light or radiation, distinct and visible.
spectrum an array of a physical system or phenomenon according to the magnitude of one of its properties such as mass or wavelength, esp. an array of light in the order of wavelengths that produces the rainbow. [2 definitions]