0 an oval fruit that has a thick, yellow skin and sour juice, or the small tree on which this fruit grows:
2 something that does not work:
Only one of his inventions turned out to be a lemon.
I felt such a lemon when I discovered I'd missed my appointment.
A margarita is made with tequila, an orange liqueur and lime or lemon juice.
Purists eat smoked salmon with nothing more than lemon and black pepper.
Just roast the chicken in the oven and baste it in oil and lemon.