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.
articular cartilage. n. The cartilage covering the articular surfaces of the bones forming a synovial joint. Also called arthrodial cartilage, diarthrodial cartilage, investing cartilage.he cartilage covering the articular surfaces of the bones participating in a synovial joint. Synonym(s): arthrodial cartilage, cartilago articularis, diarthrodial cartilage, investing cartilage.