Definition of knack. 1  1 : a special ready capacity that is hard to analyze or teach. 2  2a : a clever trick or stratagemb : a clever way of doing something. 3  3 archaic : an ingenious device; broadly : toy, knickknack.
Medical Definition of gingivoplasty. plural. gingivoplasties. : a surgical procedure that involves reshaping the gums for aesthetic or functional purposes.
Definition. Myasthenia gravis (MG) is the most commonly occurring disorder of neuromuscular junction transmission and is characterized by weakness and fatigue of skeletal muscles. It is a T-cell dependent antibody-mediated autoimmune disease.Back to Top.yasthenia gravis (MG) is the most commonly occurring disorder of neuromuscular junction transmission and is characterized by weakness and fatigue of skeletal muscles.