bitternut ['bitәnʌt]
n.
心果山核桃
bitternut[ noun ]
hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts
<noun.plant>
Bitternut \Bit"ter*nut"\, n. (Bot.)
The swamp hickory ({Carya amara}). Its thin-shelled nuts are
bitter.