Word of the Day

Penumbral “relating to or being a shadowy area” is the adjectival form of New Latin penumbra, which 17th-century astronomer Johannes Kepler coined in 1604 as a combination of Latin paene “almost” and umbra “shade.” Umbra is also the source of the English terms somber, umber, umbrage, and umbrella, all of which originally had senses related to shadows or darkness. While penumbra and umbra in the context of astronomy today both refer to the shadow that results when a planetary body cuts off direct light, a penumbra results when the light is only partially cut off, while an umbra results when the light is fully blocked. Penumbral was first recorded in English in the 1660s.

Chaebol “a South Korean conglomerate” is a direct borrowing from Korean and is composed of chae “wealth, property” and pŏl “clique, faction.” However, while chaebol is a Korean term, its origins lie across the Sea of Japan; chaebol reflects the Korean pronunciation of the kanji characters that are used in Japanese to spell the word zaibatsu “a large industrial or financial conglomerate of Japan,” making chaebol the Korean loan translation of zaibatsu. Both chaebol and zaibatsu originated as borrowings from Middle Chinese dzoi “wealth” and bjot “powerful family” (compare Mandarin Chinese cái and fá). Chinese is a member of the Sino-Tibetan language family, and though neither Japanese nor Korean belongs to this family, earlier versions of the Chinese language were once heavily influential on the non-Sinitic languages of East Asia. Chaebol was first recorded in English in the 1970s.

Empyrean “the highest heaven” ultimately derives via Late Latin from Ancient Greek empýrios “fiery,” from pŷr “fire,” which is the source of words such as pyre, pyrite, and pyro- and is distantly related to English fire. The Ancient Greeks believed that the world around them comprised five elements—fire, water, air, earth, and ether—and although ether was considered a distinct airlike element found in the upper atmosphere, there was some overlap with fire; ether (Ancient Greek aithḗr) was related to the verb aíthein “to burn” and was considered together with fire to constitute the heavens and emit light and heat. Empyrean was first recorded in English in the early 1600s.

Hex “to bewitch” is a borrowing via Pennsylvania Dutch from German hexen, related to the noun Hexe “witch.” Hexe is a cognate of the English word hag “witch, sorceress; ugly old woman,” and the two are shortened from Old High German hagazussa and Old English hægtesse, respectively. Though hex and hag have long had negative connotations in English because of their magical associations, theories about their origin are far less biased; the haga-/hæg- element may derive from a root meaning “able, skilled” or could be connected to hawthorn, hay, and hedge, thereby reflecting a historical link between plants and sorcery. The -zussa/-tesse element, in turn, may be related to a variety of words in the Indo-European language family with meanings such as “fairy,” “ghost,” and “demon.” Hex was first recorded in English in the 1820s.

Fartlek “a training technique consisting of bursts of intense effort” is a direct borrowing from Swedish and comprises the elements fart “speed” and lek “play.” Fart is cognate with the English verb fare “to go, travel,” as found in the nouns warfare, wayfarer, and welfare, from a Proto-Indo-European root per- “to pass over.” Other derivatives from this root include port, portable, and portal (via Latin porta “door, gate” and portāre “to carry”) and pore and emporium (via Ancient Greek póros “passage”). Lek may be related to English lark “a carefree adventure; to have fun” but has a far more popular relative: LEGO, the name of a brand of interlocking plastic bricks, from Danish leg godt “to play well.” Fartlek was first recorded in English in the 1950s.