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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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