صفو

يَوْمٌ صَفْوَانُ ذ , (S, M, K,) and ↓ صَافٍ, (M, K,) A day in which the sun is clear, and which is very cold: (S:) or a cold day, (K,) or a very cold day, (M,) without clouds and without thickness [ of the air ]. (M, K.) ― -b2- صَفْوَانُ is also a name of The second of the days of cold: (K, TA:) so called because the sky therein is clear of clouds: [as a proper name,] it is determinate, and imperfectly decl. (TA. [See also صُفَيَّةُ.]) -A2- صَفْوَانٌ [as a coll. gen. n., of which the n. un. is with ة; and said to be used as a sing. and as a pl.]: see صَفًا, in three places.