Knot (wood defect)
A hard, usually round section of a tree branch embedded in a board. The grain of the knot is perpendicular to the grain of the board. Knots decrease the strength of the board and should be avoided where strength is needed.
Aviation Maintenance Technician Handbook — Airframe, p. G-20
Also defined in 3 more sources
A speed measurement that is equal to one nautical mile per hour. One knot is equal to 1.15 statute mile per hour.
Aviation Maintenance Technician Handbook — Airframe, p. G-20
A unit of speed equal to one nautical mile per hour.
The knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph.