ˌdaɪ.ə.fəˈɹiː.sɪs ˌpɜːspəˈɹeɪʃən ˌpɝspəˈɹeɪʃən salty fluid secreted by sweat glands sweat poured off his brow the process of the sweat glands of the skin secreting a salty fluid perspiration is a homeostatic process