term day 支付日, 开庭日, 观察日
Term day \Term day\
A day which is a term (as for payment of rent), or is a day
in a term, as of the sitting of a court; esp., one of a
series of special days, designated by scientists of different
nations or stations, for making synoptic magnetic,
meteorological, or other physical observations.
[Webster 1913 Suppl.]