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A rhombohedron. Fresnel's rhomb (Opt.), a rhomb or oblique parallelopiped of crown or St. Gobain glass so cut that a ray of light entering one of its faces at right angles shall emerge at right angles at the opposite face, after undergoing within the rhomb, at other faces, two reflections. It is used to produce a ray c…

A variety of dolomite.

Shaped like a rhomb.

A ganoid fish having rhombic enameled scales; one of the Rhomboganoidei.

Same as Ginglymodi.

ch produces infusorialike embryos; -- opposed to nematogene. See Dicyemata. [Written also rhombogen.]

Related to the rhombohedron; presenting the form of a rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron. Rhombohedral iron ore (Min.) See Hematite. -- Rhombohedral system (Crystallog.), a division of the hexagonal system embracing the rhom…

Rhombohedral.

A solid contained by six rhomboids; a parallelopiped.

An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.

Between rhomboid and ovate, or oval, in shape.

Having, or approaching, the shape of a rhomboid.

A rhomboid. [R.] Milton.

Same as Rhomb, 1.

Possessing the qualities of a prism, obliquely inclined to a rhombic base; monoclinic.

Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.

Having three rhombic faces or sides.

A silicate of aluminium, occurring usually in thick rhombic prisms, nearly square, of a grayish or pale reddish tint. It was first discovered in Andalusia, Spain.

One of the elements; a metal of a reddish white color, crystallizing in rhombohedrons. It is somewhat harder than lead, and rather brittle; masses show broad cleavage surfaces when broken across. It melts at 507º Fahr., being easily fused in the flame of a candle. It is found in a native state, and as a constituent of…

Pertaining to the shorter diagonal, as of a rhombic prism. Brachydiagonal axis, the shorter lateral axis of an orthorhombic crystal.