The quality or state of being able to descend or be descended from something; the capacity for hereditary transmission.
From 'descendable' + '-ity' suffix creating an abstract noun. Formed from 'descend' + '-able' (capable of) combining into 'descendability' in formal English.
While this is a rare formal word, it highlights an interesting truth: scientific names for traits often get more complex the more you try to describe inheritance and family lineage—our relationship to ancestors gets tangled in jargon.
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