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Rhomboid, rom′boid, n. a figure of the form of a rhomb: a quadrilateral figure having only its opposite sides and angles equal.—adj.

Why did this pillow have to be placed so as to form a rhomb; and why did the girl's head have to rest exactly upon the diagonal?

Only a rhomb of dim gaslight on my ceiling remained....

Circularly polarized light he obtained by means of a rhomb of glass, known as “Fresnel’s rhomb,” having obtuse angles of 126�, and acute angles of 54�.

Suppose that Huygens made the experiment alluded to, without design, what he really observed was that the images appeared and disappeared alternately as he turned the rhomb round.