acyclic
Concise Oxford English Dictionary © 2008 Oxford University Press:
acyclic /eɪˈsʌɪklɪk, -ˈsɪk-/
▶adjective
- 1 not displaying or forming part of a cycle.
■ (of a woman) not having a menstrual cycle.
- 2 Chemistry (of a compound or molecule) containing no rings of atoms.
'acyclic' also found in these Oxford entries:

