See Russell Towle’s explanation below.
Russell Towle is a mathematician, amateur geologist, and local history writer who currently working on an article about zonotopal tilings.
“Zome is a word coined by Steve Baer as I recall, based upon “dome,” the difference being that the geodesic dome of [Buckminster] Fuller was formed upon a network of triangles, wheres zomes are bounded by zonogons, a zonogon being a convex, centrally-symmetrical polygon. A rhomb is a zonogon, so are all regular polygons with an even number of sides, but a zonogon need not be regular.”