يفخ1 يَفَخَهُ, (K,) aor. ـَ because of the guttural letter, or يَفُخَ, accord. to the common rule observed in the K, or يَفِخَ, as though it were of the same class as وَعَدَ, (TA,) [the last is probably the most correct form, as يَأْفِخُهُ is the aor.  of أَفَخَهُ, of which يَفَخَهُ is a dial. form,] He, or it, hit him, or hurt him, on the part of his head called the يَافُوخ. (K.) يَافُوخٌ [The top of the head;] the part where the anterior and posterior bones of the head meet: [see يَأْفُوخٌ, of which it is a dial. form:] pl. يَوَافِيخُ. (TA.) ISd regards this form of pl. as an indication that the ى is a radical letter, and therefore mentions it in this art.; (TA;) [and F says the same in art. أفخ: but see that art.]. b2:  مَسَّ بِيَافُوخِهِ السِّمَاكَ (assumed tropical:)  [He touched Spica Virginis, or Arcturus, with the top of his head]. (A.) b3:  وَطِئَ فُلَانٌ يَوَافِيخَ القُرُومِ (assumed tropical:)  Such a one had lordship and eminence given to him. (A.) b4:  صَدَعُوا يَافُوخَ اللَّيْلِ (tropical:)  i. q. أَدْلَجُوا [They journeyed in the night; &c.] (A.) [See also art. أفخ.]مَيْفُوخٌ Hit, or hurt, on the part of his head called the يَافُوخ. (K.)