Definition of octad in English:


Pronunciation /ˈäktad/ /ˈɑktæd/


  • A group or set of eight.

    ‘After meiosis, the four meiotic products undergo an additional mitotic division to yield eight haploid nuclei, which differentiate into an octad of eight ascospores.’
    • ‘In this case, the first postmeiotic cells deriving from the spores have been separated to yield octads composed of four pairs of colonies deriving from a single meiosis.’
    • ‘In these cases, molecular analysis was performed on only four members of the octad.’


Mid 19th century via late Latin from Greek oktas, oktad-, from oktō ‘eight’.