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The Collaborative International Dictionary
Interaxis

Interaxis \In`ter*ax"is\, n.; pl. Interaxes. (Arch.) The space between two axes. See Axis, 6.

The doors, windows, niches, and the like, are then placed centrally in the interaxes.
--Gwilt.

Wiktionary
interaxis

n. (context architecture English) The space between two axis.