Definition of iso- in English:

iso-

Syllabification: iso-

combining form

1Equal: isochron isosceles
1.1 Chemistry (Chiefly of hydrocarbons) isomeric: isooctane

Origin

from Greek isos 'equal'.

Definition of iso- in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal