is-

combining form or iso-

Etymology: Late Latin, from Greek, from isos equal

1. : equal : homogeneous : uniform

isenergic

isacoustic

isocephaly

isotype

2. usually iso-

a. : isomer of a (specified) compound

isocyanuric acid C₃(NH)₃O₃

isovanillin CH₃OC₆H₄(OH)CHO

b.

(1) : of, relating to, or having a branched chain of carbon atoms

isohydrocarbons

isosynthesis

— compare normal 10e

(2) : having a straight chain of carbon atoms to which one branching methyl group is attached in the position next to one end

isohexyl (CH₃)₂CHCH₂CH₂CH₂−

3. usually iso- : for or from different individuals of the same species

isoantigen

isoantibody

* * *

is-

see iso-.