From shmoneh; eight -- eight.
see HEBREW shmoneh
H8066. shemini
יִ֯ת שְׁמִינִי31
adjective number eighth; — הַשְּׁמִינִי בַּיּוֺם Exodus 22:29 16t.; הַשּׁ ׳חַחֹדֶשׁ 1 Kings 6:38 4t.; masculine noun omitted 1 Chronicles 24:10 4t.; חַשְּׁמִינִת הַשָּׁנָח Leviticus 25:22; elsewhere only phrase, עַלהִֿשְּׁמִינִית 1 Chronicles 15:21, and titles Psalm 6:1; 12:1, usually according to the eighth key, or on the octave, but wholly dubious.