Greek isos equal; often wrongly thought to be an abbreviation for International Standards Organization
iso- in British English
or before a vowel is-
combining form
1.
equal or identical
isomagnetic
2.
indicating that a chemical compound is an isomer of a specified compound
isobutane
isocyanic acid
Word origin
from Greek isos equal
ISO in American English
International Organization for Standardization; International Standards Organization
iso- in American English
(ˈaɪsoʊ; ˈaɪsə)
1.
equal, similar, alike, identical
isomorph
2.
isomeric
isoalloxazine
Word origin
< Gr isos, equal
ISO in American English
abbreviation
1.
incentive stock option
2.
International Standardization Organization
3.
the numerical exposure index of a photographic film under the system adopted by the International Standardization Organization, used to indicate the light sensitivity of the film's emulsion