wane-cloudMeteorol. [? f. wane n.1or v. The sense meant to be expressed by the compound was perh. ‘a cloud in process of waning or becoming smaller’.] A cirro-stratus cloud. 1823T. Forster Res. Atmosph. Phenomena i. §6 (ed. 3) 17 Of the Cirrostratus or Wanecloud.