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Feb 16, 2026
This week’s theme
Words that sound dirty, but aren’t

This week’s words
invaginate

invaginate
Image: Amazon

invaginate
Invagination in a sea urchin
Image: Wikimedia

Previous week’s theme
Is it a noun or a verb? Both!
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A.Word.A.Day
with Anu Garg

Here’s a riddle for you:

What’s a four-letter word that ends in U-N-T and applies to a woman?

It is AUNT, of course. What were you thinking?

This week’s words are like this riddle: they may cause a momentary blush at first glance, but each is impeccably respectable.

Every word this week is 100% safe for work. If the office email filter blocks A.Word.A.Day it’s only revealing its limited vocabulary.

Welcome to a week of words that sound dirty, but aren’t.

invaginate

PRONUNCIATION:
(in-VAJ-uh-nayt)

MEANING:
verb tr.:
1. To enclose or to put into a sheath.
2. To fold inward so an outer surface becomes an inner surface, forming a cavity or pouch.

ETYMOLOGY:
From Latin invaginare (to sheathe), from vagina (sheath). Earliest documented use: 1656.

USAGE:
“[The stadium lights] loomed like the illuminated spacecraft in Close Encounters of the Third Kind, invaginating me from on high.”
Wayne C. Cooper; There’s No Place to Hide; Philadelphia Inquirer (Pennsylvania); Jan 8, 2000.

“[Patricia Highsmith] cleverly seduces the reader into identifying with Ripley until by the end our moral responses have been so invaginated, we are actively on the side of the killer.”
Andrew Wilson; The Beautiful Shadow; The Guardian (London, UK); May 17, 2003.

See more usage examples of invaginate in Vocabulary.com’s dictionary.

A THOUGHT FOR TODAY:
Politics, as a practice, whatever its professions, has always been the systematic organization of hatreds. -Henry Adams, historian and teacher (16 Feb 1838-1918)

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