Definition of "ghylls" [ghylls]

• Plural form of ghyll. (noun)

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• "En route they will parry the equally unpredictable down-draughts and may venture inadvertently into ghylls, only to ameliorate their predicament by birdlike soaring."
• "They soon found that it was impossible to make their way along the crest of the Morgai, or anywhere along its higher levels, pathless as they were and scored with deep ghylls."
• "But, Query, is not the second syllable rather _Gill_, akin to the numerous tribe of "gills" or "ghylls," in the North Countrie?"