عرتن doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• عَرْتَنَ Form Q. 1

  Q. 1 عَرْتَنَ ذ He tanned a hide with [the plant, or tree, called] عَرْتُن or عَرْتَن &c. (TA.)…

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• عَرْتُنٌ

  عَرْتُنٌ ذ , (S, K, * [in the K it is not clear whether this be thus or عَرَتُنٌ,]) and عَرْتَنٌ, (S, K,) and عَرَتَنٌ, [thus accord. to copies of the K,] with تَحْرِيك, (K, TA,) and with kesr to the ت, (TA, [which may m…

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