The linguist cataloged several X's he had found in the old manuscripts.

She circled all the x's on the worksheet to show common mistakes.

Organizers announced a new mountainbike-X series combining technical descents and head-to-head sprints.

The research lab ordered several X-trainers for the experiment.

Modern cars increasingly rely on an X-by-wire system to improve responsiveness and reduce mechanical complexity.

The sterilizer X-irradiates the surgical instruments before packaging.

When technicians inspect the chamber, the panel x-radiates briefly, so they wear protective gear.

The damaged device continued x-radiating long after the power was cut.

The samples were x-radiated before testing.

The experimental mice were X-irradiated before being monitored for immune response.