tessera

[ tes-er-uh ]
/ ˈtɛs ər ə /

noun, plural tes·ser·ae [tes-uh-ree] /ˈtɛs əˌri/.

one of the small pieces used in mosaic work.
a small square of bone, wood, or the like, used in ancient times as a token, tally, ticket, etc.

Origin of tessera

1640–50; < Latin < Greek (Ionic) tésseres four
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for tessera

tessera
/ (ˈtɛsərə) /

noun plural -serae (-səˌriː)

a small square tile of stone, glass, etc, used in mosaics
a die, tally, etc, used in classical times, made of bone or wood

Derived forms of tessera

tesseral, adjective

Word Origin for tessera

C17: from Latin, from Ionic Greek tesseres four
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012