If we're being technical the egg came way before reptiles had evolved into chickens. Although if chickens came from prehistoric reptiles then they would pretty much be chickens. I'd go with eggs though since you wouldn't consider a velociraptor a chicken, but you'd still consider a velociraptor egg an egg.
Hey, How ya dern'? I'm just your average neighborhood Automotive Tech that enjoys a bit of rsps in my off time, looking forward to living on here for a while. Hope y'all had a nice Holiday and New Year.