acorn

/หˆeษช.kษ”ษนn/
noun
  1. 1

    The fruit of the oak, being an oval nut growing in a woody cup or cupule.

  2. 2

    A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head.

  3. 3

    See acorn-shell.

  4. 4

    (usually in the plural) A testicle.

Source: https://en.wiktionary.org/wiki/acorn