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permeable

per·me·a·ble

permeable

 
 
pronunciation:
puhr mi bl
part of speech: adjective
definition: of a substance, being such that gas or liquid can penetrate or diffuse through it.
The cell membrane is permeable to water molecules.
antonyms:
impenetrable, impermeable, impervious
derivations: permeably (adv.), permeableness (n.)