Ma'anar ƙamus na kalmar "lachrymal secretion" yana nufin ruwa mai ruwa wanda glandan lacrimal na idanu ke samarwa. Wannan ruwan da aka fi sani da hawaye, yana taimakawa wajen damfarar idanuwa da mai, sannan kuma yana taka rawa wajen kare idanu daga kamuwa da kamuwa da cutar. Sirrin Lachrymal yana kunshe da ruwa, electrolytes, enzymes, da sauran abubuwa, kuma ana samar da shi ne don mayar da martani ga nau'ikan abubuwan motsa jiki, gami da motsin rai, fushin jiki, da abubuwan muhalli.