GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 182 diacritical (adj) Marking a difference diagnose (v) To distinguish, as a disease, by its characteristic phenomena diagnosis (n) Determination of the distinctive nature of a disease dialect (n) Forms of speech collectively that are peculiar to the people of a particular district dialectician (n) A logician dialogue (n) A formal conversation in which two or more take part diaphanous (adj) Transparent diatomic (adj) Containing only two atoms