The Collaborative International Dictionary
Isodiametric
Isodiametric \I`so*di`a*met"ric\, a. [Iso- + diametric.]
(Crystallog.) Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.
(Bot.) Having the several diameters nearly equal; -- said of the cells of ordinary parenchyma.
Wiktionary
isodiametric
a. Having an equal or nearly equal diameter in all directions