ALLOTROPISM
\ˈalətɹˌə͡ʊpɪzəm], \ˈalətɹˌəʊpɪzəm], \ˈa_l_ə_t_ɹ_ˌəʊ_p_ɪ_z_ə_m]\
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The existence of a substance in two or more conditions having physical variations but the same chemical composition.
By William R. Warner
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A term recently introduced into chemistry, the object of which is to express the property, possessed by certain simple bodies, of assuming different qualities on being subjected to certain modes of treatment. Carbon, for example, furnishes three forms-plumbago, charcoal, and diamond.
By Robley Dunglison
By Willam Alexander Newman Dorland