| HET | a genus of small colubrid snakes containing the North American hognose snakes |
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| HET | characterized by departure from accepted beliefs or standards |
| HET | the quality of being unorthodox |
| HET | any opinions or doctrines at variance with the official or orthodox position |
| HET | combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two |
| HET | (electronics) produced by heterodyning two oscillations |
| HET | an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones |
| HET | a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified |
| HET | of parasites |
| HET | of parasitic animals |
| HET | the quality of being diverse and not comparable in kind |
| HET | originating outside the body |