anis(o)-

Unequal, asymmetrical, dissimilar.

Greek anisos, unequal.

Terms are the negatives, using an‑ (see a‑¹), of words in iso‑. Examples are anisotropic (from Greek tropē, turn, turning), having a physical property that is not the same in every direction; anisometropia (Greek metron measure, plus ōps, ōp‑, eye), inequality of refractive power of the eyes; anisocytosis (Greek kutos, vessel), abnormal variation in the size of cells, especially of red blood corpuscles; anisogamy (Greek gamos, marriage), sexual reproduction by the fusion of dissimilar gametes; and anisophyllous (Greek phullon, leaf), having leaves of different shapes or sizes on either side of a shoot.