rhombohedron

American  

[rom-buh-hee-druhn] / ˌrɒm bəˈhi drən /

noun

plural

rhombohedrons, rhombohedra

1. a solid bounded by six rhombic planes.

---

rhombohedron British  

/ ˌrɒmbəʊˈhiːdrən /

noun

1. a six-sided prism whose sides are parallelograms

---

rhombohedron Scientific  

/ rŏm′bō-hē′drən /

plural

rhombohedrons

1. A prism with six faces, each a rhombus.

---

Other Word Forms

• rhombohedral adjective

Etymology

Origin of rhombohedron

1830–40; < Greek rhómbo ( s ) rhombus + -hedron

Example Sentences

Chalybite crystallizes in the rhombohedral system and is isomorphous with calcite; like this it possesses perfect cleavages parallel to the faces of the primitive rhombohedron, the angles between which are 73� 0′.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

Calcite cleaves in three directions parallel to the faces of the primitive rhombohedron.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

Six kinds of primitive forms were distinguished, namely, the cube, the regular octahedron, the regular tetrahedron, a rhombohedron, an octahedron with a rhombic base, and a double six-sided pyramid.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

The zig-zag lateral edges coincide with the similar edges of a rhombohedron, as shown in fig.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

In calcite, for instance, the figure has roughly the shape of a rounded rhombohedron with depressed faces and is symmetrical about three vertical planes.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various