One of the mysteries of the English language finally explained.
Genetics. Of a chromosome or part of one: showing a pattern of condensation and expansion through the cell cycle that is out of synchrony with the bulk of the chromosomal material.
Geology. Designating cyclic or repetitive patterns of deposition within a sedimentary system which are attributed to factors external to the system.
1940s; earliest use found in Journal of Genetics. From allo- + cyclic.
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