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Oakham
Oakland
Oakland Park
oakmoss
oakum
Oakville
OAM
Oamaru
OAP
oar
oarfish
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oak apple

oak ap·ple (plural oak ap·ples)


noun 
Definition:
 
growth on oak tree: a rounded hollow growth on the trunk of an oak tree caused by infestation with gall wasps, which use the growths as shelters for their larvae

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