English word for a triangle in spherical geometry with three right angles?

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French has the word trirectangle and Italian the word trirettangolo, which is a term of spherical geometry meaning a triangle with 3 right angles. What is the corresponding English word?

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Note that trirectangle is being used as an adjective in that source, not a noun: des triangles trirectangles.

The English equivalent appears to be trirectangular (spherical) triangles.