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aperture [apertures]▼(opening, hole)noun[UK: ˈæ.pə.tʃə(r)] [US: ˈæ.pər.tʃər]
orifice [orifices]▼(mouth or aperture, as of a tube, pipe)noun[UK: ˈɒ.rɪ.fɪs] [US: ˈɔː.rə.fə.sə]
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