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
...Thursday is no longer
cruciferous VEGETABLE night.
The Big Bang Theory Season 4, Episode 2
...and refers to a lantern
hand-carved from a root VEGETABLE...
The Big Bang Theory Season 3, Episode 15
[gasps] Maybe I should pick
a VEGETABLE for you.
The Big Bang Theory Season 12, Episode 8