a Jewish festival celebrated on the 22nd day of Tishri, being the 8th day of Sukkoth: marked by a memorial service for the dead and prayers for rain in Israel.
Also, Shemini Atzeret, Shemini Atzeres.
Origin: 1900–05; < Heb Shəmīnī ʿăṣereth lit., eighth meeting
She·mi·ni A·tze·reth (shə-mē'nē ät-sěr'əs, -ət) n.
Judaism A festival happening after the seventh day of Succoth, marked by a service in memory of the dead and a special prayer for rain.
[Hebrew šəmînî 'āṣeret, eighth (day) of assembly : šəmînî, eighth (from šəmōne, eight; see ṯmny in Semitic roots) + 'āṣeret, assembly (from 'āṣar, to retain; see ʕṣr in Semitic roots).]