Word of the Day

: March 18, 2023

lacuna

noun luh-KOO-nuh

What It Means

Lacuna is a formal word that refers to a gap or blank space in something—in other words, a missing part. When used with respect to biology, lacuna also refers to a small cavity, pit, or discontinuity in an anatomical structure.

// The absence of hemlock pollen from one stretch of the fossil record is a notable lacuna that suggests the tree may have once suffered from some type of blight that nearly wiped out the species.

// An osteocyte is a cell that is isolated in a lacuna of bone.

See the entry >

lacuna in Context

“When civil war broke out in 1642, the ensuing chaos was disastrous. ... In her new novel, ‘The Manningtree Witches,’ A.K. Blakemore explores the consequences of that chaos for a group of village women through the viewpoint of a narrator named Rebecca West. West, a true historical figure, was among those prosecuted in Essex. Blakemore’s novel adheres to these events but fills in the lacunae in the documents.” — Lorraine Berry, The Los Angeles Times, 23 Aug. 2021

Did You Know?

If you find yourself drawing a blank when it comes to the definition of lacuna, it might help to imagine drawing water instead, ideally from a lake or lagoon. Lacuna, lake and lagoon all come ultimately from lacus, the Latin word for “lake.” Latin speakers modified lacus into lacuna to form a word meaning “pit,” “gap,” or “pool.” When English speakers borrowed the term in the 17th century, they used it to refer to a figurative gap in or missing portion of something, such as information or text. (Note that lacuna comes with two plural options: the Latin lacunae \luh-KYOO-nee\ or \luh-KOO-nye\ or the anglicized lacunas \luh-KOO-nuz\.) Lagoon, meanwhile, hewed closer to the Latin lacuna, referring first to a shallow sound, channel, or pond near or connected to a larger body of water, and later to a shallow artificial pool or pond.