| n. | 1. | The fruit of the oak, being an oval nut growing in a woody cup or cupule. |
| 2. | (Naut.) A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head. | |
| 3. | (Zool.) See Acorn-shell. |
| Noun | 1. | acorn - fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base |
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