fenestella

noun
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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