Third is assorted pheromones.
Tread lightly.
The Big Bang Theory Season 2, Episode 21
Somewhere around
the THIRD floor,
The Big Bang Theory Season 7, Episode 7
I don'’t see anyone lining up
to be your THIRD.
The Big Bang Theory Season 12, Episode 4
A THIRD of your group died
and you did nothing, for fuck's sake.
Money Heist Season 3, Episode 2
"Is there a THIRD girl
I've forgotten about?
The Big Bang Theory Season 9, Episode 21