عيس 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.

• عَيَسٌ

  عَيَسٌ ذ (S, TA) and , the latter of the measure فُعْلَةٌ, [originally عُيْسَةٌ.] like صُهْبَةٌ and كُمْتَةٌ, (Lth, O, TA,) Whiteness in a camel, mixed with somewhat of] the red hue termed] شُقْرَة; (S, TA;) [i. e., a re…

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