a combining form meaning “unequal,” “uneven,” used in the formation of compound words: anisogamous.
Also, especially before a vowel, anis-.

< Greek, combining form of ánisos; see an-1, iso- Unabridged
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World English Dictionary
aniso- or (before a vowel) anis-
combining form
not equal: anisogamy
[New Latin, from Greek anisos; see an-, iso-]
anis- or (before a vowel) anis-
combining form
[New Latin, from Greek anisos; see an-, iso-]

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aniso- or anis-
Unequal; dissimilar: anisogamy.

The American Heritage® Stedman's Medical Dictionary
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