I am curious about the semantic origin of друг-. I have seen these examples:
друг : friend
друг друга : each other
другой : other
Obviously there is a sense of otherness about these words. My question is whether the word for "friend" came about because a friend is "another person" — meaning that the sense of "other" came first — or if the word for "friend" came first, and the sense of "otherness" logically followed.