Century Dictionary and Cyclopedia
- In geometry, of or pertaining to a rhombohedron; having forms derived from the rhombohedron.
- In crystallography, relating to a system of forms of which the rhombohedron is taken as the type. They are embraced in the rhombohedral division of the hexagonal system. See hexagonal.
GNU Webster's 1913
- adj. (Geom. & Crystallog.) Related to the rhombohedron; presenting the form of rhombohedron, or a form derivable from a rhombohedron; relating to a system of forms including the rhombohedron and scalenohedron.
- adj. having threefold symmetry
“Naturally occurring graphites are reported to contain as much as 30% of the rhombohedral (beta) form, whereas synthetic materials contain only the alpha form.”
“True, in the august presence of rhombohedral crystals, retinasphaltic resins, gehlenites, Fassaites, molybdenites, tungstates of manganese, and titanite of zirconium, why, the most facile of tongues may make a slip now and then.”
“One part decorated with delicate blue and green stripes ended abruptly where a massive red rhombohedral growth pro'truded from the monstrosity's back.”
“This insulin hexamer corresponds with the unit cell in the rhombohedral crystals first investigated and is the asymmetric unit in the monoclinic form which appears in the presence of phenol.”
“Shapes rhomboidal, perchance rhombohedral -- who knows?”
“There are two forms occurring there, the most abundant of which is the rhombohedral, after Fig. 3.”
“As in the other rhombohedral carbonates, the crystals possess perfect cleavages parallel to the faces of the rhombohedron.”
“Hot or dilute cold solutions deposit minute orthorhombic crystals of aragonite, cold saturated or moderately strong solutions, hexagonal (rhombohedral) crystals of calcite.”
“It is rhombohedral in crystallization and isomorphous with calcite and chalybite.”
“The crystals measure up to a yard across, and are rhombohedral or scalenohedral in habit; their faces are usually dull and corroded or coated with stilbite.”
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A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
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