Merriam-Webster's Word of the Day for December 6, 2023 is: permeable \PER-mee-uh-bul\ adjective

Permeable is a synonym of [penetrable](https://www.merriam-webster.com/dictionary/penetrable) that is used especially to describe things that have pores or openings that permit liquids or gases to pass through.

// The new housing project will include a permeable parking lot to help mitigate stormwater runoff.

[See the entry >](https://www.merriam-webster.com/dictionary/permeable)

Examples:

“The idea is to enable cities to soak up and retain excess water with designs focused on nature, including gardens, green roofs, wetlands and permeable sidewalks—allowing water to both sink into the ground and flow outwards.” — Laura Paddison, CNN, 26 Mar. 2023

Did you know?

“Our landscapes are changing … they’re becoming less permeable to wildlife at the precise moment animals need to move most,” writes Ben Goldfarb in his book Crossings: How Road Ecology is Shaping the Future of Our Planet. He’s describing the effects of highway infrastructure and at the same time clearly demonstrating the meaning of permeable, a word that traces back to a combination of the prefix per-, meaning “through,” and the Latin verb meare, meaning “to go” or “to pass.” Accordingly, a permeable landscape—such as one where humans have constructed wildlife overpasses—is one that allows animals to pass and spread through [unimpeded](https://www.merriam-webster.com/dictionary/unimpeded). Permeable’s relative, the verb [permeate](https://www.merriam-webster.com/dictionary/permeate) (“to spread or [diffuse](https://www.merriam-webster.com/dictionary/diffuse) through”) is another commonly used meare descendent, but other relations haven’t managed to permeate the language quite so widely, such as [meatus](https://www.merriam-webster.com/dictionary/meatus) (“a natural body passage”), [congé](https://www.merriam-webster.com/dictionary/conge) (“a formal permission to depart”), and [irremeable](https://www.merriam-webster.com/dictionary/irremeable) (“offering no possibility of return”).