A variant spelling or archaic form meaning a group of six things or a hexad.
From Greek 'hex-' (six) + '-add' (a group). This is an older or alternative spelling of 'hexad,' less commonly used in modern scientific terminology.
Older English texts sometimes used variant spellings like 'hexadd' before standardized scientific nomenclature became universal—similar to how 'gaol' and 'jail' represent spelling evolution in English.
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