First Known Use: 1697
Dictionary
impermeable
adjective im·per·me·able \(ˌ)im-ˈpər-mē-ə-bəl\
: not allowing something (such as a liquid) to pass through
Full Definition of IMPERMEABLE
: not permitting passage (as of a fluid) through its substance; broadly : impervious
— im·per·me·abil·i·ty \-ˌpər-mē-ə-ˈbi-lə-tē\ noun
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Origin of IMPERMEABLE
Late Latin impermeabilis, from Latin in- + Late Latin permeabilis permeable
Related to IMPERMEABLE
- Synonyms
- impassable (also impassible), impenetrable, impervious, impregnable
- Antonyms
- negotiable, passable, penetrable, permeable
Medical Dictionary
impermeable
adjective im·per·me·able \(ˈ)im-ˈpər-mē-ə-bəl\
Medical Definition of IMPERMEABLE
: not permitting passage (as of a fluid) through its substance <the plasma membrane of a red blood cell is relatively impermeable to sodium and calcium ions>
—im·per·me·abil·i·ty \(ˌ)im-ˌpər-mē-ə-ˈbil-ət-ē\ noun, plural im·per·me·abil·i·ties
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