Impermeable



[im-pur-mee-uh-buh l] /ɪmˈpɜr mi ə bəl/

adjective
1.
not permeable; impassable.
2.
Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.
/ɪmˈpɜːmɪəbəl/
adjective
1.
(of a substance) not allowing the passage of a fluid through interstices; not permeable
adj.

1690s, from French imperméable, from Late Latin impermeabilis, from assimilated form of in- “not, opposite of” (see in- (1)) + permeabilis (see permeable).

impermeable im·per·me·a·ble (ĭm-pûr’mē-ə-bəl)
adj.
Impossible to permeate; not permitting passage.
im·per’me·a·bil’i·ty or im·per’me·a·ble·ness n.
impermeable
(ĭm-pûr’mē-ə-bəl)
Relating to a material through which substances, such as liquids or gases, cannot pass. Some substances, such as some types of contact lenses, are permeable to gas but impermeable to liquid.

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