do you have to kill/maim animal to eat? = meat
Can you collect from animal without killing it and eat? = not meat.
clothing analogy: leather = not vegetarian. wool = vegetarian.
even "pro-life" Christians would have a hard time arguing an egg is meat - they've got a belief that a life begins with conception. unless you've got it free range with a rooster plowing those hens on the reg, your egg's pretty much just a regular menstrual cycle.
Better question though - eating placenta - is that meat? It's definitely fleshy. A hole in my prior definition perhaps..