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cirro-velum
cirro-velum n.
Brit. 
/ˌsɪrə(ʊ)ˈviːləm/
, /ˌsɪrə(ʊ)ˈviːləm/U.S. /ˌsɪroʊˈviləm/
/ˌsɪroʊˈviləm/ΚΠ
1894 W. C. Ley Cloudland vi. § 106. 128 It is difficult perhaps to understand how threads of Cirro-filum can become twisted together and interwoven so as to form Cirro-velum.
1894 W. C. Ley Cloudland vi. § 113. 132 The festoons or ‘pocks’ of Cirro-velum Mammatum appear much smoother and more regular than those of lower clouds of Reversed Interfret.
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