a. [f. Gr. ἀλλότροπ-ος (see ALLOTROPY) + -IC.] Of or pertaining to allotropy; having different physical properties, though unchanged in substance.
[Not in Craig, 1847.]
1849. Schroetter, in Rep. Brit. Assoc., 42. The allotropic red phosphorus was not ignited by friction.
1869. Mrs. Somerville, Molec. Sc., I. i. 16. Sulphur becomes allotropic by the continued application of heat.
1873. H. Spencer, Sociol., ix. 225. The constitution of ozone as an allotropic form of oxygen.
