Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
"Iso" Definition
noun
An isolation play in which the fullback leads the tailback into the opposing defensive line.
Source: Wiktionary
International Organization for Standardization.
Source: Oxford Dictionary
residual
(in the UK) Imperial Service Order, awarded to British and commonwealth civil servants (discontinued in 1993).
Source: Oxford Dictionary
abbreviation
International Organization for Standardization; International Standards Organization.
Source: Merriam-Webster
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