嗜酸性是指可以在高酸環境下(通常在pH 5.0 或以下[1] )下茁壯成長的生物。有些生物如古菌、細菌、 [2]和真核生物、鹽桿菌科[3]、酸桿菌門[4]、酸硫桿菌目、硫杆狀菌屬、醋桿菌屬、脂環酸芽孢桿菌屬[5]都屬於嗜酸性生物。
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