Etymology.

The word etymology is derived from the Greek word ἐτυμολογία (etumología), itself from ἔτυμον (étumon), meaning "true sense", and the suffix -logia, denoting "thestudy of". In linguistics, the term etymon is used to refer to a word or morpheme (e.g. stem or root) from which a later word is derived.

Our youngest son is very interested in words, their meanings, their origins and roots and what they mean now and what they originally meant.  He has an incredible reading and speaking vocabulary.  Today, he let me know that he has figured out the original meanings and origin of all of the English cuss words and why they are considered rude.   

I'm so proud.