octad

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Related to octadic: octonary

oc·tad

(ok'tad),
1. Synonym(s): octavalent
2. An octavalent element or radical.
[L. octo, eight]
Farlex Partner Medical Dictionary © Farlex 2012

octad

the eight ascospores contained in a fungal ASCUS.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005