Edward William Lane, An Arabic-English Lexicon, ت

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تَهَمٌ أهم هام هم هما تهم تهمة وهم [in the CK, erroneously, تَهْم] Land descending (أَرْضٌ مُتَصَوِّبَةٌ [in the CK, here and afterwards, erroneously, مُتَصَوِّيَة]) to the sea; as also ↓ تَهَمَةٌ ; (K, TA;) mentioned by IKt, from Ez-Ziyádee, from As: (TA:) these two words seem to be [originally] inf. ns. from تِهَامَةُ: (K:) [and accord. to F,] ↓ التَّهْمَةُ is a dial. var. of ↓ تِهَامَةُ : (K:) [but J says,] ↓ التَّهَمَةُ is used in the place of ↓ تِهَامَةُ , as though it were [originally] the inf. n. un., accord. to the saying of As that التَّهَمُ, with fet-h to the medial radical, is an inf. n. from ↓ تِهَامَةُ : (S:) for the ↓ تَهَائِم [pl. of تِهَامَةُ, and thus meaning the parts of Tihámeh, or, accord. to the JK, meaning lands descending to the sea,] do descend to the sea: (K, TA:) so says As: (TA:) and [hence] the rájiz says, (namely, Sheytán Ibn-Mudlij, TA,) “ نَظَرْتُ وَالعَيْنُ مُبِينَةُ التَّهَمْ
” [I looked, the eye distinguishing Et-Taham], (S, and Ham p. 659,) meaning Et-Tihámeh. (Ham ibid.) ― -b2- [As inf. n. of تَهِمَ, q. v.,] التَّهَمُ also signifies Vehemence of heat, and [or with] stillness of the wind. (K.) And hence Tihámeh is said to be thus called. (TA.)