"Words are, of course, the most powerful drug used by mankind."
- Rudyard Kipling

What's in a Word
The scientific study of language and its structure, including the study of morphology, syntax, phonetics, and semantics. Specific branches of linguistics include sociolinguistics, dialectology, psycholinguistics, computational linguistics, historical-comparative linguistics, and applied linguistics.

The method of human communication, either spoken or written, consisting of the use of words in a structured and conventional way.

The whole system and structure of a language or of languages in general, usually taken as consisting of syntax and morphology (including inflections) and sometimes also phonology and semantics.

Where do some of our words and phrases come from? What words have changed in meaning? What words do we no longer use? Languages are ever evolving, from gaining new words from other cultures (zeitgeist), to words being created (youthquake), and to words being left unused (fortnight). After moving, combining, and cleaning up the linguistics and reference sections I found plenty of words I want to start adding to my vocabulary, but now it is time for a bumper. Here are some books that dig deep into words and language and the history behind them.
What's In A Word: Etymological Gossip About Some Interesting English Words
 by Robert Gorrell
The Miracle of Language
 by Richard Lederer
The Word Museum: The Most Remarkable English Words Ever Forgotten 
by Jeffrey Kacirk
Dark Tongues: The Art of Rogues and Riddlers 
by Daniel Heller-Roazen
Idiom Savant: Slang As It Is Slung
by Jerry Dunn
The World in a Phrase: A Brief History of the Aphorism
by James Geary