acorn

[ey-kawrn, ey-kern]
noun
1.
the typically ovoid fruit or nut of an oak, enclosed at the base by a cupule.
2.
a finial or knop, as on a piece of furniture, in the form of an acorn.

Origin:
before 1000; Middle English acorne (influenced by corn), replacing akern, Old English æcern, æcren mast, oak-mast; cognate with Old Norse akarn fruit of wild trees, Middle High German ackeran acorn, Gothic akran fruit, yield < Germanic *akrana-; alleged derivation from base of acre is dubious if original reference was to wild trees

acorned, adjective
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World English Dictionary
acorn (ˈeɪkɔːn)
 
n
the fruit of an oak tree, consisting of a smooth thick-walled nut in a woody scaly cuplike base
 
[C16: a variant (through influence of corn) of Old English æcern the fruit of a tree, acorn; related to Gothic akran fruit, yield]

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Etymonline
Word Origin & History

acorn
O.E. æcern "nut," common Gmc. (cf. O.N. akarn, Du. aker, Low Ger. ecker "acorn," Goth. akran "fruit"), originally the mast of any forest tree, and ultimately related (via notion of "fruit of the open or unenclosed land") to O.E. æcer "open land," Goth. akrs "field," O.Fr. aigrun "fruits
and vegetables" (from a Gmc. source); see acre. The sense gradually restricted in Low Ger., Scand. and Eng. to the most important of the forest produce for feeding swine, the mast of the oak tree. Spelling changed by folk etymology association with oak (O.E. ac) and corn (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As the oak is germinant in the acorn, so society is germinant in the family.
Hot rocks were then added to the acorn mush or soup and moved about with
  paddles until the acorn meal was cooked.
Common name from the acorn almost entirely enclosed in the spherical cup.
The engineering of the lightning rod and the acorn which holds it in place
  represents an astonishing achievement.
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