Meteorol. [? f. WANE sb.1 or 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.
1823. T. Forster, Res. Atmosph. Phenomena, i. § 6 (ed. 3), 17. Of the Cirrostratus or Wanecloud.