Meniscus (plural: menisci) has different meanings:
Meniscus in liquids
is a curve in the surface of a liquid, produced in response to the surface of the container or another object. It can be either concave or convex. A convex meniscus occurs when the molecules of the liquid repel the molecules of the container or object. This may be seen between mercury and glass in barometers. Conversely, a concave meniscus occurs when the molecules of the liquid attract those of the container. This can be seen between water and glass. Surface tension acts on concave menisci to pull the liquid up, and on convex menisci to pull the liquid down. This phenomenon is important in transpirational pull.
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Meniscus in the body
Also, the meniscus is a term used to refer to one of two parts of the human knee. The knee contains a lateral meniscus and a medial meniscus, and both are cartilaginous tissues that provide structural integrity to the knee when it undergoes tension and torsion. In sports and orthopedics, people will sometimes speak of "meniscus surgery," or a "torn meniscus," and be referring to an injury to one of these two pads.
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