(physics) a fluid whose stress at each point is linearly proportional to the strain rate at that point

(physics) a fluid whose stress at each point is not linearly proportional to the strain rate at that point; i.e. its viscosity depends on the applied shear force

(physics) A proposed extension to Newtonian dynamics that would obviate the need to assume the presence of dark matter.

Not Newtonian

(humorous) December 25, Sir Isaac Newton's birthday (in the Julian calendar). / (humorous) December 25 through January 4, Sir Isaac Newton's birthday (in the Gregorian calendar).

plural of Newtonmas

plural of Newtonian

A type of reflecting telescope using a concave primary mirror and a flat diagonal secondary mirror.

plural of Newtonian telescope

Alternative letter-case form of Newtonian.