استدار doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• استدار Form 10

  10 استدار استدار ٱستدار [It had, or assumed, a round, or circular, form; it coiled itself, or became coiled; it wound, or wound round;] it was, or became, round. (KL.) You say, استدار القَمَرُ [The moon became round, or …

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