Definition of 間日 (まび)

noun
1.
day off (between working days)
2.
50th, 53rd, 55th or 59th day of the sexagenary cycle
See also:八専
3.
non-fever day (when running an intermittent fever, e.g. malaria)
Other readings:
間日【あいび】
Related Kanji
interval, space
day, sun, Japan, counter for days