| defenestration | (noun) the act of throwing someone or something out of a window | - |
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| fenestella | (noun) oval or circular opening; to allow light into a dome or vault | Synonyms: lunette |
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| fenestra | (noun) a small opening covered with membrane (especially one in the bone between the middle and inner ear) | - |
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| fenestration | (noun) surgical procedure that creates a new fenestra to the cochlea in order to restore hearing lost because of osteosclerosis | - |
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| (noun) the arrangement of windows in a building | - |
| safeness | (noun) the quality of being safe | - |
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| stiffener | (noun) a member attached to a beam web to prevent loss of strength due to web buckling. | - |
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| (noun) material used for stiffening something | - |