Shirabe
English jmdict
1
noun (common) (futsuumeishi) day off (between working days)
2
noun (common) (futsuumeishi) 50th, 53rd, 55th or 59th day of the sexagenary cycle
See also:
3
noun (common) (futsuumeishi) non-fever day (when running an intermittent fever, e.g. malaria)