Like certain trees

• Barrel-flavored, as wine
• Like some Scotch
• Like some Chardonnays
• Like a mighty tree
• Reminiscent of wood, as some wines
• Wine nuance word
• Like some chards

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Oaky \Oak"y\ ([=o]k"[y^]), n. Resembling oak; strong. --Bp. Hall.

Wiktionary Word definitions in Wiktionary
a. Describing the taste of wine that has been aged in oak and acquired tannins from the wood.