Of course it is. It's a little wrong
to say a tomato is a VEGETABLE.
The Big Bang Theory Season 2, Episode 20
The world's most boring liquid
and the world's most boring VEGETABLE,
The Big Bang Theory Season 10, Episode 13
And not a VEGETABLE in sight.
The Big Bang Theory Season 8, Episode 18
[gasps] Maybe I should pick
a VEGETABLE for you.
The Big Bang Theory Season 12, Episode 8
...and refers to a lantern
hand-carved from a root VEGETABLE...
The Big Bang Theory Season 3, Episode 15