biduum

== Latin == === Etymology === From bis (“twice”) and diēs (“day”). === Noun === bīduum n (genitive bīduī); second declension A period of two days ==== Declension ==== Second-declension noun (neuter). ==== Related terms ==== trīduum quadrīduum === References === “biduum”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers