Rheum

Rheum may refer to:

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The genus Rheum. See Rhubarb.

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The medical term for the natural, watery discharge from the eyes which forms a crust on the eyelids during sleep.

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Eyelid: An eyelid is a thin fold of skin and muscle that covers and protects an eye. A muscle is used to slide the membrane over the surface of the eye ("closing" the eye) and to retract the membrane ("opening" the eye). This can be either voluntarily or involuntarily. The human eyelid feature a row of e...

Sleep: Sleep is the regular state of natural unconsciousness observed in all mammals, birds and fish. It is heavily influenced by circadian rhythms, and by hormonal and environmental factors as well. Sleep appears to perform a restorative function for the brain and body, as evidenced by the myriad symptoms...