ˈrhombeous,a.rare—0. [f.mod.L. rhombeus, f. rhombus: see -eous.] Rhomboid. 1797Encycl.Brit. (ed. 3) III. 442/1 Rhombeous, or rhomboidal.1858Mayne Expos.Lex., Rhombeus,..presenting four parallel sides, two by two, forming two acute angles and two obtuse..; rhombeous.