(physics) The ratio of the mass of a substance to that of an equal volume of water at 4°C (or to some other reference substance)

An optical instrument used for spectrographic analysis .

(obsolete, intransitive) To think, meditate or reflect on a subject; to consider, to deliberate or cogitate.

(physics) The portion of the electromagnetic spectrum that is visible to humans. / (physics) an extension of the human-visible spectrum to include near-visible wavelengths, primarily near infrared.

(thermodynamics) An obsolete term for specific heat capacity.

Britain standard form of specialty.

(film, television) An effect that cannot be reasonably achieved by normal means, as for example by the digital manipulation of previously filmed footage.

Characterized by speculation; based on guessing, unfounded opinions, or extrapolation. / Pursued as a gamble, with possible large profits or losses; risky.

(analytical chemistry) Of or relating to spectroscopy or to a spectroscope.

(astronomy) A classification of stars depending on their spectra and luminosity; usually one of O, B, A, F, G, K, M.