What does fenestella mean?
Fenestella is a noun denoting a small window or window-like opening, most commonly encountered in ecclesiastical architecture, where it names the narrow opening — often a group of three slender lights — situated behind the altar of a church. Such openings may have served practical purposes, such as light and ventilation for the sanctuary, and they survive in many medieval churches, where they are prized by architectural historians as evidence of early building phases. The word derives directly from Latin fenestella, a diminutive of fenestra, meaning 'little window,' and it shares this root with more familiar English words such as fenestration and defenestration. In palaeontology, Fenestella is also the genus name of an extinct group of lace-like colonial bryozoans abundant in Palaeozoic rocks. Though rare outside specialist writing, the word adds precision to descriptions of church interiors and ancient fossils alike, making it a valuable term for students of architecture, archaeology, and natural history.
A small window or window-like opening, especially one or a group of three narrow openings behind the altar in a church.
"Each fenestella was glazed with thin sheets of horn rather than glass."
Chiefly used in architectural history and descriptions of ecclesiastical buildings.
(Fenestella) A genus of extinct fan-shaped, lace-like colonial bryozoans common as fossils in Palaeozoic strata.
"The shale was crowded with fronds of Fenestella."
Capitalized as a taxonomic genus name and conventionally italicized.
Both the Latin-style plural 'fenestellae' and anglicized 'fenestellas' are found; the Latinate plural is preferred in formal architectural writing.
"Three slender fenestellae lit the space behind the altar."
The little window hiding behind your church's altar has its own Latin name — and it's literally called a 'small door.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fenestella
Fenestella comes directly from Latin fenestella, the diminutive of fenestra ('window'), thus literally 'a little window.' The term was adopted into English architectural vocabulary, likely in the seventeenth century or later, to describe the small altar-side openings found in medieval churches. It belongs to the same Latin family as English fenestration and defenestration, all ultimately traceable to fenestra.
How fenestella is actually used
A technical term used mainly by architectural historians and ecclesiastical scholars; in palaeontological contexts it is capitalized as a genus name. Rare in everyday speech and generally italicized or capitalized when referring to the fossil genus.
Easily confused with fenestella
A fenestra is any anatomical or architectural opening, whereas a fenestella is specifically a small window-like opening, typically behind a church altar.