fen·​es·​tel·​la | \ ˌfenəˈstelə \

Definition of fenestella

1 plural -s
a : a niche like a window in the south wall of the sanctuary near the altar (as of a Roman Catholic church) containing the piscina and often also the credence
b : a small window or opening like a window (as in an altar front for allowing relics within to be seen)
2 capitalized [New Latin, from Latin, small window] : a genus (the type of the family Fenestellidae) of Paleozoic bryozoans whose colonies form lacy fronds — compare lace bryozoan

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History and Etymology for fenestella

Latin, small opening or window, diminutive of fenestra window

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“Fenestella.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fenestella. Accessed 7 Mar. 2021.

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