مُرِنَّةٌ

is applied as an epithet to birds [apparently as meaning Uttering plaintive sounds]: (S:) and, as also ↓ مِرْنَانٌ, as an epithet to a bow [as meaning twanging], and so to a cloud (سَحَابَة) [apparently as meaning resounding with thunder]: (M:) and each is applied to a bow [itself]; (S, K;) and the latter, to a cloud [itself]; as an epithet in which the quality of a subst. is predominant [so as to imply, apparently, the meaning of resounding with thunder, or because it is hoped that it will resound with thunder, or because it often does so]. (M.)