Test Your Knowledge - and learn some interesting things along the way.

Look closely at the following Latin verbs, all of which are derived from the verb "trudere" ("to push"): "extrudere," "intrudere," "obtrudere," "protrudere." Each of these Latin verbs has an English descendant whose meaning involves pushing or thrusting. Another "trudere" offspring, "abstrudere", meaning "to push away" or "to conceal," gave English "abstrude," meaning "to thrust away." But that verb didn't make it past the 17th century. The "abstrudere" descendant that did survive is "abstruse," an adjective that recalls the meaning of its Latin parent "abstrusus," meaning "concealed."

Examples

The author's new book is not as abstruse as his previous works and is likely to attract a much larger readership.

"It was the kind of spectacle that policy wonks savor - three days of complex and abstruse arguments before the U.S. Supreme Court…." - From an article by Andrew B. Wilson in the Southeast Missourian, April 4, 2012