"made of, or consisting of, the wood of the oak," late 14c. (12c. in surnames and place-names), oken, from oak + -en (2). Similar formation in Old Frisian eken, Dutch eiken, Old High German eichen, German eichen, Old Norse eikinn.
the old oaken bucket
o'er
O.D.
oaf
oafish
oak
oaken
oakum
oar
oarlock
oarsman
oasis