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orifice
 Orifice
physiol. abbr. O
to-pipe diameter ratio
- only individual words found (there may be no translations for some thesaurus entries in the bilingual dictionary)

Orifice [ˈɒrɪfɪs], US: [ˈɔːrəfɪs] n
physiol., abbr. O
orifice ['ɔrɪfɪs] abbr.
abbr., tech. orf