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Definition of Harderian gland
1. Noun. A gland found within the eye's orbit in vertebrates that possess a nictitating membrane. ¹
¹ Source: wiktionary.com
Medical Definition of Harderian gland
1. A sebaceous gland that, in some animals, acts as an accessory to the lacrimal gland. The harderian gland excretes fluid that facilitates movement of the third eyelid. (12 Dec 1998)