This is the 842nd most frequent Lithuanian word.
greitosios
"Greitosios" means "ambulance" in English.
In this sentence, 'greitosios' is used as part of a compound noun ('greitosios pagalbos'), meaning 'emergency' or 'ambulance assistance'.
Greitosios pagalbos automobilis stovėjo prie ligoninės.
The ambulance was parked near the hospital.
Here, 'greitosios' is used as a standalone plural noun, referring to the emergency medical service (ambulances).
Kai mano draugui pasidarė bloga, greitosios atvyko labai greitai.
When my friend felt unwell, the ambulance arrived very quickly.
In this case, 'greitosios' modifies 'brigada', indicating the type of team—emergency responders.