Angel-lights, in architecture, are the upper panes of glass or "lights'" in a curved window frame, next to the springing. Probably a corruption of the word angle lights, as the structures are nearly triangular.[1]

References

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  1. ^   One or more of the preceding sentences incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). "Angel-lights". Encyclopædia Britannica. Vol. 2 (11th ed.). Cambridge University Press. p. 8.