noun
a series of indentations or loopholes in a wall or other fortification for shooting through or for decoration
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The medieval castle was adorned with intricate crennellations along the outer walls.
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The old fort had cool crennellations on the top that we could hide behind during our game of hide and seek.
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Check out the crennellations on that building, they look pretty badass.
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The crennellations of her mind were filled with thoughts of adventure and excitement.