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Porous vs Airstone - What's the difference?

porous | airstone |

As an adjective porous

is full of tiny pores that allow fluids or gasses to pass through.

As a noun airstone is

a piece of aquarium furniture, traditionally limewood or porous stone, whose purpose is to diffuse oxygen gradually into the tank, eliminating the noise and large bubbles of conventional air filtration systems.

porous

English

Adjective

(en adjective)
  • Full of tiny pores that allow fluids or gasses to pass through.
    • Sponges are porous so they can filter water while trapping food.
    Concrete is porous , so water will slowly filter through it.
  • (Of legislation) full of loopholes
  • (figuratively) With many gaps.
  • * {{quote-news
    • , year=2011 , date=May 14 , author=Peter Scrivener , title=Sunderland 1 - 3 Wolverhampton , work=BBC Sport citation , page= , passage=However, Wolves porous defence opened up again to gift Sunderland a foothold in the game - Sessegnon sweeping in a Zenden corner that was inexplicably allowed to bounce in the six-yard box. }}

    Synonyms

    * (full of holes ): permeable

    airstone

    English

    Noun

    (en noun) (wikipedia airstone)
  • A piece of aquarium furniture, traditionally limewood or porous stone, whose purpose is to diffuse oxygen gradually into the tank, eliminating the noise and large bubbles of conventional air filtration systems.

    • Synonyms

    * bubbler

    Anagrams

    * * * * *