The hippocampus is a small area area of the brain that controls short term memory. Hippocampus come the Greek words "hippos" and "kampos", literally "horse sea monster". Hippocampus is also the name of the genus that seahorses are in. Early scientists thought the part of the brain looked like a seahorse.

Karaoke is a Japanese word that derives from the words "kara", meaning empty, and "okesutora, meaning orchestra. Karaoke literally means "empty orchestra".

The English word "battologize" means to repeat a word or phrase to an excessive degree. Battologize is derived from the ancient Greek word "battologia", which means "stammering(repeated or stuttering) speech". Battologize most likely shares a root with the English word "batter" (battering-ram, battery[assault]), which means "To hit heavily and repeatedly with violent blows."

The word lethologica comes from the greek words for "forgetfulness" and "word" ("letho" and "logos" respectively). It means the act of forgetting a word. However, lethologica is seen as more of a pathological disease than the related "tip-of-the-tongue" forgetfulness that almost everyone suffers from at some point.

The number forty is the only number that, in the English language, has all of its letters in alphabetical order.