Having the quality of combining or tending to combine; relating to or involving combination.
From 'combinant' plus the suffix '-ive' (from Latin, meaning 'tending to'). This is quite rare and highly technical, primarily appearing in specialized scientific vocabulary.
Words ending in '-ive' often describe tendencies or qualities — 'creative' means 'tending to create,' so 'combinantive' means 'tending to combine,' but it's so obscure most scientists would just say 'combining.'
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