GNU Collaborative International Dictionary of English

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1.       
   Acorn (), n. [AS. æcern, fr. æcer field, acre; akin to D. aker acorn, Ger. ecker, Icel. akarn, Dan. agern, Goth. akran fruit, akrs field; -- orig. fruit of the field. See Acre.]
   1. The fruit of the oak, being an oval nut growing in a woody cup or cupule.
   
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   2. (Naut.) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.
   
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   3. (Zool.) See Acorn-shell.
   
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