1) something with a piercing cry 1a) bird of piercing cries 1a1) ostrich
Full Brown-Driver-Briggs lexicon entry
רְנָנִיםnoun [masculine] pluralbird of piercing cries, i.e. ostrich, according to ᵑ9 Bo Di and most, ׳כְּנַף רJob 39:13, but read probably יְעֵנִים Hoffm Bu Du (as Lam 4:3 Qr), see [ יָעֵן].