An antiquark is the antiparticle of a quark.

He was expelled from the party because he took anti-party actions.

He is known as an anti-war activist.

They appear to be antagonistic on the surface, but in reality, they are seemingly not part of the same group.

He is involved in the research of particle accelerators.

A fermion is one of the fundamental constituents of matter.

This check valve has the role of preventing water from flowing backwards.

Reverse Polish notation is one method of expressing calculations.

His son was born with clubfoot.

In geomorphology, an antidune is a special type of sand dune that forms on the downstream side of a water flow.