Acorn

1. n. See Acorn-shell.
2. n. The fruit of the oak, being an oval nut growing in a woody cup or cupule.
3. n. A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.