one who studies things that are almost the same, but are slightly different
Jenni-" Man, that was a good arse orange."
Kyle-"Double U tee eff! That was a clemintine!"
Herpotologist-"That is correct, sir."
an occurance of two things that are very similar, but have slight differences
two identical twins, seperated shortly after birth, same everything, sept for like umm finger prints. I couldn't use the word in a sentence......but thats an example of one.