rhomb (romb)

[OF. rhombe, F. rhombe = Sp. It. rombo = Pg. rhombo, Rhomb. See how in warlike muster they appear, In rhombs , and wedges, and half-moons, and wings. Milton , P. R., iii. 309. 2. In crystal., a solid bounded by six equal and similar rhombic planes; a rhombohedron.-3. In zool., a pair of semi rhombs forming a rhombic figure, as certain plates of cystic crinoids. - 4. A material circle. [Rare.] That swift Nocturnal and diurnal rhomb suppos'd, Invisible else above all stars, the wheel Of day and night; which needs not thy belief If earth, industrious of herself, fetch day Travelling east, and with her part averse From the sun's beam meet night, her other part Still luminous by his ray. Milton , P. L., viii. 134. Fresnel's rhomb, a rhomb of crown-gla , 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 under IMG:content-2218.jpg:[graphic] IMG:content-2219.png:[blocks in formation]