بسم1 بَسَمَ: see 5, with which it is syn. b2:  [Hence,] مَا بَسَمْتُ فِى الشَّىْءِ (tropical:)  I did not taste the thing. (K, TA.) 5 تبسّم; and ↓ ابتسم; and ↓ بَسَمَ, aor. ـِ inf. n. بَسْمٌ (S, M, Msb, K) and مَبْسَمٌ; (K, * TA;) [He smiled;] these verbs signify less than ضَحِكَ [so that they are properly explained by the Latin subrisit]: (S, Msb:) or he opened his lips like him who displays to another his teeth: (Lth, TA:) or he laughed in the least degree and in the most beautiful manner: (M, K:) or he laughed a little without any sound: (Msb:) or تَبَسُّمٌ is the beginning of ضَحِكٌ [or laughter]: (Towsheeh, and Neseem er-Riyád, in TA art. ضحك, q. v.:) accord. to Zj, it is the utmost degree of laughing of the prophets. (M.) b2:  [Hence,] السَّحَابُ ↓ ابتسم عَنِ البَرْقِ (M,) or تبسّم عَنْهُ (TA,) i. q. اِنْكَلَّ عنه [i. e. (tropical:)  The clouds displayed a faint flashing of lightning]. (M, TA.) b3:  And تبسّم الطَّلْعُ (tropical:)  The extremities of the طلع [i. e. the spadix, or the spathe, of the palm-tree,] burst asunder. (TA.) 8 إِبْتَسَمَ see 5, in two places.بَسَّامٌ (S M, K) and ↓ مِبْسَامٌ (S, K) epithets from بَسَمَ, (M, K,) applied to a man, (S, M,) meaning كَثِيرُ التَّبَسُّمِ [That smiles much]. (S.) بَاسِمٌ part. n. of بَسَمَ [meaning Smiling]. (K, TA.) مَبْسِمٌ i. q. ثَغْرٌ (S, K,) meaning The front teeth: (TK:) [and sometimes, perhaps, the mouth:] so called as being the place of التَّبَسُّم [or smiling: pl. مَبَاسِمُ]. (TA.) One says, [of women or girls,] هُنَّ غُرُّ المَبَاسِمِ [They are white in the front teeth]. (TA.) مِبْسَامٌ: see بَسَّامٌ