Decorated with or furnished with towers; towered or having towers; architecturally distinguished by multiple towers.
From 'be-' combined with 'tower' as the root, creating an adjective meaning 'furnished with towers.' The past participle form suggests something that has been equipped or adorned with towers.
Medieval castles were described as 'betowered' to emphasize their impressive fortifications—the word itself creates an image of a skyline bristling with towers, which simple 'towered' doesn't quite capture.
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