Surely this word appears in your dictionary. But it appears in the dictionary with ה and not with ת as its ending letter.
The reason for this is quite clear: in the construct state of feminine nouns, usually a final ה changes to a final ת.
Noun נְקוּדָה is a feminine noun meaning dot (punctuation), point, full stop, settlement.
So, (the) point of.
Whenever this noun unites to noun 114, namely the group נקודת המוצא, then the meaning is the point of departure.