tavlin

However, this appears to be the result of a mistake, for originally the singular form for spice was tevel תבל, and the Aramaic form tavlin was the plural (In the Ben Yehuda dictionary, Tur-Sinai writes that the original reading was like the Sefardi tevalin, but the Ashkenazim read the word as tavlin.)

Balashon - Hebrew Language Detective Balashon 2010

The Hebrew word for "spice" is tavlin תבלין, with the plural tavlinim

Balashon - Hebrew Language Detective Balashon 2010

Ruth Almagor-Ramon writes that although tavlin overcame tevel as the singular noun for "spice" (after serious debate among linguists in the last century - see Yad Halashon p. 608), there's no reason to adopt תבלן as the verb.

Balashon - Hebrew Language Detective Balashon 2010