Ma'anar ƙamus na "matsewar iska" tana nufin iskar da ake dannewa da adanawa a ƙarƙashin matsi a cikin akwati ko tsarin. Ana iya amfani da wannan matsewar iskar don dalilai daban-daban, kamar sarrafa kayan aikin pneumatic ko injina, hura tayoyi, ko ma bayar da tallafin numfashi a wuraren kiwon lafiya.
