n. The property of assuming or of existing under two distinct forms. Specificallyn. In crystallography, the property of assuming two distinct crystalline forms not derivable from each other, as by crystallization.n. In botany, the occurrence of two distinct forms of flowers or other parts upon the same plant, or upon plants of the same species.n. In zoology, difference of form, structure, size, coloration, etc., between individuals of the same species.n. In philology, the existence of a word under two or more forms called doublets; thus, dent and dint, fat and vat, church and kirk, exhibit dimorphism developed within English, and card and chart, choir, quire, and chorus, reason, ration, ratio, etc., exhibit dimorphism arising outside of English.n. In petrography, modifications produced within the magma of an igneous rock by mineralizing or crystallizing agents before its solidification.