Plural of festschrift, using English pluralization rules; multiple collections of scholarly essays honoring distinguished academics.
From 'festschrift' plus English plural '-s,' anglicizing the German term. As English increasingly absorbed this German loan word, English speakers naturally applied familiar pluralization patterns.
The fact that we can't agree on whether to say 'festschriften' or 'festschrifts' shows English speakers slowly conquering German words—we always want to add '-s'.
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