περίχυμα

ατος, τό
A. that which is poured round or over, wash, Dsc. 1.87 ; of whey, Gal. 17 (1).983.
II. that which is diffused around the earth, atmosphere, τὸ ἱερὸν π. Herm. ap. Stob. 1.49.44.
III. ablution, Marin. Procl. 26.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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