Something that is permeable can be passed through, especially by liquids or gases. "I wish I hadn't worn my permeable sweater to the picnic when the weatherman called for thunderstorms. The rain seeped right through the fabric, soaking me to the skin."

A permeable surface allows materials like liquids to pass through — either in or out. Inside the body, the walls of cells are permeable membranes that allow fluids and nutrients to get in and nourish the cells. A permeable shirt is good to wear in the summer, because it helps release the sweat sticking to the skin.

Definitions of permeable
  1. adjective
    allowing fluids or gases to pass or diffuse through
    permeable membranes”
    “rock that is permeable by water”
    permitting the unwanted passage of fluids or gases
    able to absorb fluids
    (of a membrane) selectively permeable
    admitting of passage or entrance
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    preventing especially liquids to pass or diffuse through
    of such close construction as to be impermeable
    having the power, capacity, or quality of retaining water
    water-repellent, water-resistant
    hindering the penetration of water
    imperviable, impervious
    not admitting of passage or capable of being affected
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