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reflectance the ratio of the amount of radiation, esp. light, that is reflected from a surface to that of the radiation originally on the surface.
reflecting telescope an optical telescope that uses mirrors rather than lenses to focus light rays. (Cf. refracting telescope.)
reflection the act of reflecting or state of being reflected. [4 definitions]
reflective created by or resulting from reflection. [2 definitions]
reflector a surface that throws back heat, light, or sound. [2 definitions]
reflex denoting or pertaining to an involuntary physiological response or reaction to a stimulus. [7 definitions]
reflex camera a camera fitted with a mirror behind the lens which reflects the image onto a ground glass plate to achieve an exact focus.
reflexive of a pronoun, used as an object that refers back to the subject of a sentence, as "himself" in "He admired himself in the mirror". [4 definitions]
refloat combined form of float.
refluent flowing back, as in a tide; ebbing.
reforest to plant new trees in (an area formerly forested).
reform the improvement of wrong or bad conditions, esp. by political means. [5 definitions]
re-form to gather or form again.
reformable combined form of reform.
reformat combined form of format.
reformation the act of reforming or condition of being reformed. [2 definitions]
reformatory intended to improve or reform. [2 definitions]
reformed purged of faults, abuses, and errors. [3 definitions]
reformer a person who works to bring about reform or improvement; reformist. [2 definitions]
reformist a person supporting or advocating reform. [2 definitions]
reform school see reformatory.