Source : Webster's Revised Unabridged Dictionary (1913)

Acyclic \A*cyc"lic\, a. [Pref. a- not + cyclic.]
   Not cyclic; not disposed in cycles or whorls; as:
   (a) (Bot.) Of a flower, having its parts inserted spirally on
       the receptacle.
   (b) (Org. Chem.) Having an open-chain structure; aliphatic.

Source : WordNet®

acyclic
     adj 1: botany; not cyclic; especially having parts arranged in
            spirals rather than whorls [ant: {cyclic}]
     2: chemistry; not cyclic; having an open chain structure [syn:
        {open-chain}] [ant: {cyclic}]