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Wikipedia definition
1. Pileus (meteorology)A pileus, also called scarf cloud or cap cloud, is a small, horizontal, altostratus cloud that can appear above a cumulus or cumulonimbus cloud, giving the parent cloud a characteristic "hoodlike" appearance. Pilei tend to change shape rapidly. They are formed by strong updrafts acting upon moist air at lower altitudes, causing the air to cool to its dew point.
Read “Pileus (meteorology)” on English Wikipedia
Read “頭巾雲” on Japanese Wikipedia
Read “Pileus (meteorology)” on DBpedia

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