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noun
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abbreviation
HAO
abbr.
abbr.
High Altitude Observatory
abbr., avia.
Hamilton, Ohio USA
abbr., med.
Health Action Overseas
abbr., scottish
Hydrated aluminium oxide
energ.ind.
high-activity oxide
mil.
hardware action officer
tech.
high-altitude observatory
HAO
abbr.
abbr., oil
higher alpha olefin
;
highly aromatic oil
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