re-entrant

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re-entrant. Two faces of a building meeting at an external angle form a salient, while two walls meeting at an internal angle form a re-entrant. An external angle or salient with an internal angle formed in it, as though, on plan, a small square had been removed from the angle of the building, is a re-entrant.

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re-entrant An embayment or recess in a scarp or along a main valley, often of sufficient length to form a tributary.

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re-entrant An embayment or recess in the flank of a main valley, often of sufficient length to form a tributary.