Synonym of D-Day (“the date of any major event planned for the future”)

(computing, trademark) Former name of macOS; itself formerly known as Mac OS X.

plural of X-stool

plural of X-chair

plural of X-stretcher

(physics) A hypothetical elementary particle that couples quarks to leptons, analogous to the W boson and Z boson, but corresponding to a new type of force predicted by the Georgi–Glashow model.

plural of X boson

plural of x-intercept

(mathematics) A root; a zero; a point at which a line crosses the x-axis of a Cartesian grid, where y is 0.

plural of X-mas