side chain

Noun

 * 1)  That part of a molecule attached to some core structure; a radical.
 * 2)  Any of 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).
 * 3)  Auxiliary audio input fed to a synthesizer etc. and used to selectively trigger an effect.
 * 4)  A separate blockchain attached to a parent blockchain (mainchain) to extend its functionalities.
 * 5)  On some railways, a chain fitted on both sides of a centre coupler or buffer at each end of a rail vehicle, which has a hook for connection to a corresponding chain on the next vehicle in a train.
 * 1)  On some railways, a chain fitted on both sides of a centre coupler or buffer at each end of a rail vehicle, which has a hook for connection to a corresponding chain on the next vehicle in a train.
 * 1)  On some railways, a chain fitted on both sides of a centre coupler or buffer at each end of a rail vehicle, which has a hook for connection to a corresponding chain on the next vehicle in a train.
 * 1)  On some railways, a chain fitted on both sides of a centre coupler or buffer at each end of a rail vehicle, which has a hook for connection to a corresponding chain on the next vehicle in a train.

Verb

 * 1)  To use auxiliary audio input in that manner.