1 International Standards Organization
2 Imperial Service Order (a Brit. decoration)
iso- , (before a vowel) is-
1 equal or identical
2 indicating that a chemical compound is an isomer of a specified compound
isobutane, isocyanic acid
(from Greek isos equal)
n (Photog) a classification of film speed in which a doubling of the ISO number represents a doubling in sensitivity; for example, ISO 400 film requires half the exposure of ISO 200 under the same conditions. The system uses identical numbers to the obsolete ASA rating
(C20: from International Standards Organization)
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