Interesting. Are you a medical doctor? Colic looks to be in the medical dictionary.
https://www.medicinenet.com/script/main/art.asp?articlekey=2779
No. Are you? That doesn't look like a dictionary to me.
It's a bit like "spastic colon" in that it's a catch all for "We can't pin point what exactly is causing this...therefore it's colic" which I believe is the point he was getting to.
Often it's quite easily just diagnosed as colic for lack of an exact answer and solution.
Correct, thanks!