ostium

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osti.um              N      2 4 NOM S N                 
osti.um              N      2 4 VOC S N                 
osti.um              N      2 4 ACC S N                 
ostium, osti(i)  N (2nd) N   [XXXBO]  
doorway; front door; starting gate; entrance (underworld); (river) mouth;
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