Adjective: (Latin: perspicere, to see through) clear in a statement or expression; easily understood.
Adjective: intended as instructional. Noun: a book, speech, essay, etc., that is protreptic.
Adjective: short-lived, transitory. Noun: an ephemeral thing; with a plural verb; ephemeral things collectively.
Noun: a state of equilibrium, balance, or stagnancy; a stoppage of the flow of some fluid in the body as of blood.
Adjective: of affected by, or causing vertigo; dizzy or dizziness; whirling about, spinning; marked by quick or frequent change; unstable. Pierre Guesnon is a retired engineer who founded and ran an engineering company in Boston for many years, until he retired fifteen years ago. Since then, he has lived most of each year on Marco Island. He is married to an Australian, Margaret Guesnon, whom he met in London and married in Sydney. They have two daughters. Pierre has had a lifelong interest in words and language.