Meshetich, Мешетич (a patient's surname).
Well, thanks, Antonina and Sarushka. I was farther off than I thought in my about that word. I initially thought it referred to a locale for the photo, but now am inclined to believe it may be the name of the patient in question. You can see that there is a bit of similar writing just outside the border of this photo (and on one of the others) which may also be an identifier for persons in the photos.
As interesting, and maybe a harder question is, was that the writing of Olga, another of OTMA, or some hospital personnel, or added for identification by the collator of these photos much later? Hmmm?