porous

adjective

po·​rous ˈpȯr-əs 

1

a

: possessing or full of pores

b

: containing vessels

hardwood is porous

2

a

: permeable to fluids

b

: permeable to outside influences

3

: capable of being penetrated

porous national boundaries

porously adverb

porousness noun

Synonyms of porous

• penetrable
• permeable

Examples of porous in a Sentence

The country has a porous border.

a cleaner that should not be used on porous surfaces

Recent Examples on the Web

The Kings put together a nice five-game win streak towards the end of the season, but their porous defense will be no match for the Avs’ top line of Nathan MacKinnon, Artturi Lehkonen and Martin Necas. —Corey Masisak, Denver Post, 18 Apr. 2026

Covalent organic frameworks have been explored as potential electrolyte materials because of their porous and stable structures. —Neetika Walter, Interesting Engineering, 17 Apr. 2026

Sandy soil is porous and fast draining, and as the moisture decreases, so do some of the nutrients. —Karen Brewer Grossman, Southern Living, 17 Apr. 2026

But within their bouncy, porous interior lies a world of possibility. —Shilpa Uskokovic, Bon Appetit Magazine, 13 Apr. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing porous

• diffuse-porous
• ring-porous

Rhymes for porous

• chloris
• chorus
• horus
• lores
• morrice
• morus
• orris
• porus
• torus
• authorise
• clitoris
• liquorice

Kids Definition

porous

adjective

po·​rous ˈpōr-əs 

ˈpȯr-

1

: full of pores

2

: capable of absorbing liquids

Medical Definition

porous

adjective

po·​rous ˈpōr-əs, ˈpȯr- 

1

: possessing or full of pores

porous bones

2

: permeable to fluids