For healthy skin, collagen is key: This naturally occurring protein keeps skin smooth and youthful, but our bodies produce less collagen as we get older. The result? Thinner skin, dryness, and more wrinkles.
Definition of BLACK BILE. : a humor of medieval physiology believed to be secreted by the kidneys or spleen and to cause melancholy. ADVERTISEMENT.1681. a humor of medieval physiology believed to be secreted by the kidneys or spleen and to cause melancholy. ADVERTISEMENT. 1681.
Noun. 1. black bile-a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy. melancholy. bodily fluid, body fluid, liquid body substance, humour, humor-the liquid parts of the body.1  Facebook.2  Twitter.. black bile-a humor that was once believed to be secreted by the kidneys or spleen and to cause sadness and melancholy. melancholy. bodily fluid, body fluid, liquid body substance, humour, humor-the liquid parts of the body. 1  Facebook. 2  Twitter.