1. tetrahedron

noun. (ˌtɛtrəˈhiːdrən) Any polyhedron having four plane faces.
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Etymology
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3. regular

adjective. (ˈrɛgjəlɝ, ˈreɪgjəlɝ) Often used as intensifiers.

4. regular

adjective. (ˈrɛgjəlɝ, ˈreɪgjəlɝ) Conforming to a standard or pattern.
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Etymology
regular (English)

5. regular

adjective. (ˈrɛgjəlɝ, ˈreɪgjəlɝ) Regularly scheduled for fixed times.
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Etymology
regular (English)

6. regular

adjective. (ˈrɛgjəlɝ, ˈreɪgjəlɝ) In accord with regular practice or procedure.
Synonyms
Etymology
regular (English)

8. regular

adjective. (ˈrɛgjəlɝ, ˈreɪgjəlɝ) Occurring at fixed intervals.
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