isodiametric Syllabification: (i·so·di·a·met·ric)Pronunciation: /ˌīsōˌdīəˈmetrik/Definition of isodiametric adjective chiefly Botany (of a cell, spore, etc.) roughly spherical or polyhedral. isodiametric in other Oxford dictionaries Definition of isodiametric in the British & World English dictionary