airstone

== English == === Etymology === From air +‎ stone. === Noun === airstone (plural airstones) 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 === Reitanos, Restaino, arsonite, asterion, notaries, notarise, rai stone, senorita, señorita, tonaries