Plurals in Sindarin words are formed by modifying their vowel sounds, and Emyn Beraid is a prominent example of this process. Emyn is the plural form of the more common amon, 'hill' (as for example in Amon Hen, the 'Hill of Sight'). Beraid is also plural, formed from barad, 'tower', as in Barad-dûr the 'Dark Tower'. So, a single hill with a single tower would be Amon Barad, but as there were actually several hills with three Elf-towers, the plural form Emyn Beraid is used instead.
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