[ey-sahy-klik, ey-sik-lik]
not cyclic: an acyclic flower; acyclic compounds.
Chemistry. of or pertaining to a compound that does not contain a closed chain or ring of atoms (contrasted with cyclic ).

1875–80; a-6 + cyclic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acyclic (eɪˈsaɪklɪk, eɪˈsɪklɪk)
1.  chem not cyclic; having an open chain structure
2.  botany having flower parts arranged in a spiral rather than a whorl

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
acyclic   (ā-sī'klĭk, ā-sĭk'lĭk)  Pronunciation Key 
  1. Not cyclic. Used especially of flowers whose parts are arranged in spirals rather than in whorls, as in magnolias.

  2. Having an open-chain molecular structure rather than a ring-shaped structure.

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