Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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threonine an amino acid found in many proteins that is essential in the diet of humans but not essential in the diet of most animals.
tune in to adjust (a radio or television) so it receives signals from a certain station, or to select (a certain station or program) on a radio or television. [2 definitions]
venin any of the various poisonous constituents of animal venoms.
zenith the point in the sky that is directly over the head of the observer. (Cf. nadir.) [2 definitions]