A substance that stimulates the production and flow of tears.
From Greek 'dakryon' (tear) + 'agogos' (leading or bringing). The '-agogue' suffix means 'that which leads' and is used in medical terms for substances that promote certain body processes.
Some medicines and irritants are natural dacryagogues—they make your eyes water intentionally, which is why onions make you cry and why doctors sometimes use tear-stimulating drops!
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