A small opening or window-like structure, especially in architecture or biology, or a genus of small colonial marine animals (bryozoans).
From Latin 'fenestra' (window) combined with the diminutive suffix '-ella' (small). Originally an architectural term for small decorative openings; later adopted in zoology for the fenestella bryozoan colonies that resemble tiny windows.
Fenestella bryozoans look like fossilized lace under a microscope—each tiny 'window' is actually where a living animal poked out, and colonies millions of years old are so delicate they look like they'll blow away.
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