We don't have synonyms for air stone yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are air stove, ayr stone and airstone.
(n) :
Alternative form of 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.]
(n) :
Alternative form of 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.]