Mr. Hobart (“Medical Language of Luke”) says that the number of words referring to pregnancy, barrenness, etc., used by Luke, is almost as large as that used by Hippocrates. Compare Luk 1:31; Luk 1:24; Luk 2:5; Luk 1:7; Luk 20:28. All of these, except Luk 1:24, are peculiar to himself, and all, of course, in common use among medical writers.
Hid (περιέκρυβεν)
Only here in New Testament. Περί signifies completely; entire seclusion.