Greek word
sárx
σάρξ
What it means
flesh, i.e. the meat of an animal, or the body, or as the symbol of what is external, or as the means of kindred), or human nature and passions), or, a human being
flesh (as stripped of the skin), i.e. (strictly) the meat of an animal (as food), or (by extension) the body (as opposed to the soul (or spirit), or as the symbol of what is external, or as the means of kindred), or (by implication) human nature (with its frailties (physically or morally) and passions), or (specially), a human being (as such)
Where it comes from
probably from the base of saróō (σαρόω)