David's Definitions for June:
Etymology is the history of the evolution of words over time. Look up a word in a dictionary, and, in addition to its definition, you'll find a brief version of its etymology - how it changed from a Latin or French or German or other word into the English word we now use. Folk etymology is a popular but mistaken idea about a word's etymology. It often seems to make sense - for example, the origin I gave for bistro a couple of months ago. Or it may be amusing - for example, the story that the sirloin steak got that name when an English king was so delighted with his steak that he knighted it, saying, "I dub thee Sir Loin." (Actually, sirloin comes from the French "sur," above, and "longe," loin, and used to be spelled surloin in English.) In some cases, the folk etymology catches on and the spelling or meaning of a word changes as a result. An example is shamefaced, which didn't start out referring to shame in one's face but rather as shamefast or shamfast, meaning "held fast in shame." Which is sort of how I feel about that bistro definition.