sanitary
US /ˈsæn.ə.ter.i/
UK /ˈsæn.ə.ter.i/

1.
relating to the conditions that affect health and hygiene, especially the provision of clean drinking water and adequate sewage disposal
:
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The city improved its sanitary conditions by upgrading the water treatment plant.
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Good sanitary practices are essential to prevent the spread of disease.
2.
clean and not harmful to health
:
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Always ensure your hands are sanitary before preparing food.
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The hospital maintains a highly sanitary environment.