American Heritage® Dictionary of the English Language, Fourth Edition
Century Dictionary and Cyclopedia
- n. In locomotive engines, one of the chains fixed to the sides of the tender and engine for safety, should the central drag-bar give way.
- n. The driving-chain which transmits motion to the driving-wheels of a motor-car from the counter-shaft or compensating-shaft. One is placed outside of the body of the vehicle on each side, an arrangement which necessitates two chains, and is distinguished from the center-chain design, which uses one chain under the body and near the center of the vehicle.
- n. Same as receptor. See immunity, 5.
- n. chemistry in organic chemistry, that part of a molecule attached to some core structure; a radical
- n. biochemistry the variable parts of amino acids that extend from the peptide backbone in proteins; they are referred to as R-groups, which branch off the backbone at the alpha carbon (Cα).
GNU Webster's 1913
- adj. (Chem.) a chain of atoms attached to the main structure of a large molecule, especially of a polymer.
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