In a state of being on or along a ridge; positioned on the edge or crest of something.
From a- (on, in) + ridge (Old English 'hrycg'). Middle English formation combining prefix and noun to create a locational adverb.
Geologists use 'aridge' to describe geological formations that sit precariously on mountain ridges—it's a specialized term that shows how old English prefixes like 'a-' can make nouns into descriptive locations.
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