In a manner relating to or exhibiting allotropy, which is when an element exists in multiple different physical forms.
From allotropic (relating to allotropy) plus -ally suffix. Allotropic comes from Greek 'allo-' (other) and 'tropos' (turning/form), literally meaning 'turning other ways.' The term was coined in the 1840s to describe elements like carbon that appear in different forms.
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