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Being but humble lexicographers, we cannot say whether an apple a day truly keeps the doctor away, but as far as regimens go, one could do a lot worse than snackin’ on a McIntosh. Regimen, which usually refers to a system of rules or guidelines—often for living a healthy life or taking a regular dose of exercise—comes ultimately from a Latin verb, regere, meaning “to direct.” Regere_led in apple-pie order to the English word regimen, first by way of the Latin noun regimen, meaning “steering” or “control,” and then via the Medieval Latin regimen, referring to a set of rules. Other regere descendants fell further from the tree, including correct, erect, region, rule, and surge. Be sure not to confuse regimen with another of its kin, regiment, which refers to a military unit, as doing so could upset the apple cart.

Across time and across cultures—as evidenced from Chauvet-Pont d’Arc’s paintings to The Lion King — lions have captured people's imaginations. Though the big cats themselves are fascinatingly complex, it’s perhaps no surprise that humans have long projected qualities of bravery and regality upon the proverbial "king of the beasts". It is precisely those and similar admirable qualities that led, in the 18th century, to lion being used for a person who is similarly well-regarded, especially after a long and distinguished career in a particular field, as in "lion of the Senate", or "literary lion". This sense of lion the verb lionize, which first appeared in English in the early 19th century to apply to acts of treating someone as, perhaps, deserving of roaring applause.

Grok may be the only English word that derives from Martian. Yes, we do mean the language of the planet Mars. No, we're not getting spacey; we've just ventured into the realm of science fiction. Grok was introduced in Robert A. Heinlein's 1961 science fiction novel Stranger in a Strange Land. The book's main character, Valentine Michael Smith, is a Martian-raised human who comes to Earth as an adult, bringing with him words from his native tongue and a unique perspective on the strange ways of earthlings. Grok was quickly adopted by the youth culture of America and has since peppered the vernacular of those who grok it.

When you reach the zenith, you're at the top, the pinnacle, the summit, the peak. Zenith developed from an Arabic phrase meaning "the way over one's head" and then traveled through Old Spanish, Medieval Latin, and Middle French before arriving in English. As long ago as the 1300s, English speakers used zenith to name the highest point in the celestial heavens, directly overhead. By the 1600s, zenith was being used for other high points as well. The celestial term is often contrasted with nadir, which refers to the point that is vertically downward from the observer (imagine a line going through the Earth from the observer's feet and out the other side into the sky). Figuratively, nadir simple means "the lowest point".