Relating to the Harderian gland, a small gland found in the eyes of many vertebrate animals.
Named after Johann Jacob Harder, a 17th-century German anatomist who first described the gland. The anatomical term '-ian' indicates it is named after this person.
Many animals have this mysterious gland that humans don't—it helps protect their eyes and may produce a special oily secretion that's still not completely understood by scientists.
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