| refrigerate |
preserve by chilling; "many foods must be refrigerated or else they will spoil" cool or chill in or as if in a refrigerator; "refrigerate this medicine"
출처: wordnet.princeton.edu/perl/webwn
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| refraction |
the change in direction of a propagating wave (light or sound) when passing from one medium to another deflection: the amount by which a propagating wave is bent
출처: wordnet.princeton.edu/perl/webwn
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| refractive index |
the ratio of the velocity of light in a vacuum to that in a medium
출처: wordnet.princeton.edu/perl/webwn
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| refractory |
not responding to treatment; "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains" temporarily unresponsive or not fully responsive to nervous or sexual stimuli; "the refractory period of a muscle fiber" furnace lining: lining consisting of material with a high melting point; used to line the inside walls of a furnace fractious: stubbornly resistant to authority or control; "a fractious animal that would not submit to the harness"; "a refractory child"
출처: wordnet.princeton.edu/perl/webwn
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| refresh |
review: refresh one's memory; "I reviewed the material before the test" make (to feel) fresh; "The cool water refreshed us" freshen: become or make oneself fresh again; "She freshened up after the tennis game" make fresh again
출처: wordnet.princeton.edu/perl/webwn
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