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.
Gingivitis is a periodontal disease that is an inflammatory response to bacterial buildup on the teeth, which is known as plaque. Gingivitis is characterized by swollen, tender gums that may be bright red or purple.