different between scalene vs disphenoid

English

Alternative forms

• scalenus (noun)

Etymology

Borrowed from Late Latin scal?nus (“of unequal sides”), from Ancient Greek ???????? (skal?nós, “uneven, unequal”).

Pronunciation

• (Received Pronunciation) IPA^(key): /?ske?.li?n/
• (General American) IPA^(key): /?ske??lin/, /ske??lin/
• Rhymes: -i?n

Adjective

scalene (not comparable)

1. (trigonometry) Having sides unequal in length.

2. (anatomy) Of or pertaining to the scalene muscle.

Derived terms

Translations

Noun

scalene (plural scalenes)

1. (anatomy) Ellipsis of scalene muscle.
2. (trigonometry) Ellipsis of scalene triangle.

See also

• equilateral
• isosceles

References

• “scalene”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
• “scalenus”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
• “scalene”, in Merriam–Webster Online Dictionary, (Please provide a date or year).

Anagrams

• Senecal, canelés, cleanse, elances, enlaces, enscale

Italian

Adjective

scalene

1. feminine plural of scaleno

Latin

Pronunciation

• (Classical) IPA^(key): /ska?le?.ne/, [s?kä???e?n?]
• (Ecclesiastical) IPA^(key): /ska?le.ne/, [sk??l??n?]

Adjective

scal?ne

1. vocative masculine singular of scal?nus

English

Etymology

From di- (“twice, double”) +? sphenoid (“wedge-shaped crystal or bone of the skull”).

Adjective

disphenoid (not comparable)

1. (mineralogy) Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system.
2. (mineralogy) Of or pertaining to a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.

Noun

disphenoid (plural disphenoids)

1. (geometry) A non-regular tetrahedron whose four faces are congruent acute-angled triangles.
   • 1973, H. S. M. Coxeter, 3rd Edition, unnumbered page,

     To make a model of a disphenoid, cut out an acute angled triangle and fold it along the joins of the mid-points of the sides. The disphenoid is said to be rhombic or tetragonal according as the triangle is isosceles or scalene.

   • 1977, Elizabeth A. Wood, Crystals and Light: An Introduction to Optical Crystallography, 2nd Revised Edition, page 8,

     If you rotate the [tetragonal] disphenoid 90° around its 2-fold axis and then perform the operation of inversion through the center-point of the object, it will occupy its original position again.

   • 1993, Horst Martini, A Hierarchical Classification of Euclidean Polytopes with Regularity Properties, Tibor Bisztriczky, Peter McMullen, Rolf Schneider, Asia Ivic Weiss (editors), Polytopes: Abstract, Convex and Computational, Proceedings of the NATO Advanced Study Institute, page 83,

     In addition it should be remarked that there are two types of disphenoids, with different symmetries: the tetragonal disphenoid (having isosceles facets) and the rhombic one.

Synonyms

• (non-regular tetrahedron with congruent faces): bisphenoid, equifacial tetrahedron, isosceles tetrahedron

Derived terms

• rhombic disphenoid
• snub disphenoid
• tetragonal disphenoid