Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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adj
Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
adj
Of or pertaining to a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Topics: chemistry, geography, geology, mineralogy, natural-sciences, physical-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A non-regular tetrahedron whose four faces are congruent acute-angled triangles.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
Synonyms: none provided
Antonyms: none provided
History
From di- (“twice, double”) + sphenoid (“wedge-shaped crystal or bone of the skull”).
