Edward William Lane, An Arabic-English Lexicon, ط

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طَرْفٌ ذ The eye; a word having no pl. in this sense because it is originally an inf. n., (S, O, K,) therefore it may denote a sing. and may also denote a pl. number [i. e. may signify also eyes]: (S, O, Msb:) or, (K,) as Ibn-'Abbád says, (O,) it is a coll. n. signifying the بَصَر [which has the sing. and the pl. meanings mentioned above, as well as the meaning of the sense of sight], and is not dualized nor pluralized: or, as some say, it has for pl. أَطْرَافٌ: (O, K:) but this is refuted by the occurrence of طَرْف in a pl. sense in the Kur xxxvii. 47 and xxxviii. 52 and lv. 56: (O:) and though الأَطْرَاف is said to occur as its pl. in a trad. of Umm-Selemeh, this is a mistake for الإِِطْرَاق: (Z, O:) it is said, however, that its being originally an inf. n. is not a reason for its not being allowable to pluralize it when it has become a subst., and especially when it is not meant to convey the signification of an epithet: (MF:) [but it may be regarded as an epithet; meaning seer, and, being originally an inf. n., seers also; and this is the more probable because] ↓ الطَّوَارِفُ [is an epithet used as a subst., and thus] signifies the eyes, (S, O, K,) as in the saying هُوَ بِمَكَانٍ لَا تَرَاهُ الطَّوَارِفُ [He is in a place in which the eyes will not see him]; (S, * O, * TA;) pl. of ↓ طَارِفَةٌ . (TA.) ― -b2- [Hence,] الطَّرْفُ is the name of (assumed tropical:) Two stars, which precede الجَبْهَةُ, (S, O, K,) so called because (K) they are [regarded as] the two eyes of Leo; one of the Mansions of the Moon: (S, O, K:) [often called الطَّرْفَةُ, q. v.:] the طَرْف of Leo, consisting of two small stars in front of الجَبْهَة, like the فَرْقَدَانِ, but inferior to them in light, and having somewhat of obliquity; the Ninth Mansion of the Moon: (Kzw in his descr. of that Mansion:) or the star [app. lambda] in the face of Leo, together with that which is outside [app. alpha] on the figure of Cancer: (Kzw in his descr. of Leo:) or the bright star [alpha] on the hinder, southern, leg, or foot, [i. e. claw,] of Cancer. (Kzw in his descr. of Cancer.) [See مَنَازِلُ القَمَرِ, in art. نزل.] ― -b3- And طَرْفُ العَيْنِ signifies The eyelid. (TA.) -A2- Also طَرْفٌ, A man generous, or noble, (K, TA, [see also طِرْفٌ,]) in respect of ancestry, up to the greatest [i. e. most remote] forefather. (TA.) -A3- See also طَرَفٌ, first sentence.