Nycthemeron
Defined in 2 dictionaries — Black's (1910), Black's (1891)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The whole natural day or day and night, consisting of twenty-four hours. Enc. Lond.
A Dictionary of Law
Henry Campbell Black · 1891
The whole natural and night, consisting of twenty- ©.C. An abbreviation, in the civil law, for “opecousilio,” (q.v.) In American law, these letters are used as an abbreviation for “Orphans’ Court,”