A-sample



noun
the primary urine or blood sample used in doping tests in professional sports; if the A-sample tests positive, the B-sample is tested to confirm or invalidate the results See also B-sample

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    noun the side of a gramophone record regarded as the more important one Historical Examples And yf e addicioun sholde be made to a cifre, sette it a-side, and write in his place .5. The Earliest Arithmetics in English Anonymous

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    a battery or other source of power for heating the filament or cathode heater of an electron tube.



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