trianguloidadj.
Etymology: < Latin triangulum triangle n. + -oid suffix.Previous versions of the OED give the stress as: triˈanguloid.
rare.
the world > space > shape > angularity > specific angular shape > [adjective] > triangular > approximately
18.. H. Spencer (O.) A trianguloid space.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2019).