BDB8817
שְׁמִינִי יִ֯ת31 adjective [number] eighth; — בַּיּוֺם הַשְּׁמִינִי Exod 22:29 + 16 t.; ׳ חַחֹדֶשׁ הַשּׁ 1Kgs 6:38 + 4 t.; masculine noun omitted 1Chr 24:10 + 4 t.; הַשָּׁנָח חַשְּׁמִינִת Lev 25:22 elsewhere only phrase, עַלהִֿשְּׁמִינִית 1Chr 15:21, and titles Ps 6:1; Ps 12:1, usually according to the eighth key, or on the octave, but wholly dubious.