The 'must' of their bodies?

[BlueFairyBugsBooks]

I'm just reading a book for review purposes, and the author keeps referring to the 'must' of things. Such as "the familiar must of his body" or 'the comforting must of his old jacket"

Do they mean 'musk'? Or have I been getting the word wrong my entire life?

I think it only stood out because I'd not heard it before.

Name and shame those oofers!