Pronunciation: f ə - ' nes-tr ə
Function: noun
Inflected Form: plural -trae \ - ˌ tr ē , - ˌ tr ī \
Etymology: New Latin, from Latin, window
Date: circa 1737
1 : a small anatomical opening (as in a bone): as a : OVAL WINDOW ― called also fenestra ova · lis \ - ō - ' v ā -l ə s \ fenestra ves · tib · u · li \ -ves- ' ti-by ə -( ˌ )l ē \ b : ROUND WINDOW ― called also fenestra cochleae fenestra ro · tun · da \ -r ō - ' t ə n-d ə \
2 : an opening cut in bone
– fe · nes · tral \ -tr ə l \ adjective