
(Hebrew: `may he [i.e., God] remember`), the opening word of memorial prayers recited for the dead by Ashkenazic (German-rite) Jews during synagogue ...
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http://www.britannica.com/eb/a-z/y/9

A prayer in commemoration of the dead, which is recited on the last days of Passover, Shavuot and Sukkot, and on the Yom Kippur. The term also refers to the memorial service held on each of those days, at which the members of the congregation remember their relatives who have died.
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http://www.goldsteinsfuneral.com/glossary/

Memorial service recited on Yom Kippur, as well as the last days of Sukot, Pesach, and Shavuot.
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https://www.encyclo.co.uk/local/23058

Memorial services held on Yom Kippur and on the last day of Pesach, Shavout, and Sukot.
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https://www.encyclo.co.uk/local/23058

A memorial prayer
Found on
https://www.encyclo.co.uk/local/23062

the Jewish service for commemorating the dead, held on Yom Kippur, Shemini Atzereth, the second day of Shavuoth, and the last day of Passover.
Found on
https://www.infoplease.com/dictionary/yizkor

Memorial prayer recited four times a year.
Found on
https://www.irakaufman.com/jewish-funeral-and-mourning-rituals-glossary.htm
No exact match found.