noun: (organic chemistry) That part of a molecule attached to some core structure; a radical.
noun: (biochemistry) 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).
noun: (audio) Auxiliary audio input fed to a synthesizer etc. and used to selectively trigger an effect.
noun: (cryptocurrencies) A separate blockchain attached to a parent blockchain (mainchain) to extend its functionalities.
verb: (audio) To use auxiliary audio input in that manner.
