- having equal diameters or axes.
- (of a spore or cell) having nearly equal diameters throughout.
- (of crystals) having two, or three, equal horizontal axes and a third, or fourth, unequal axis at right angles thereto.
- having diameters of the same length
- (of a crystal) having three equal axes
- (of a cell or similar body) having a similar diameter in all planes
