What is a lemons?

Answer 1

A lemon is a yellow fruit, one of the most sour of citrus fruits. Lemons contain seeds of various sizes, and the lemon tree is particularly thorny. A "lemon" is also a term applied to a chronically faulty automobile, or other mechanical device.

Answer 2

There is no such thing as a lemons. There is such a thing as a lemon though. It is a yellow coloured Rugby ball shaped fruit. Lemons would be the plural of lemon and it means more than one of them. But "a lemons" doesn't exist.

Hope my answer helped.