SPLITTING

Of something solid, to divide fully or partly along a more or less straight line.

"He has split his lip."

Of something solid, particularly wood, to break along the grain fully or partly along a more or less straight line.

To share; to divide.

"We split the money among three people."

An instance where something splits.

A division in the mind, or affecting one's sense of self.

The cleavage of a covalent bond.

Resembling the sound of something being split or ripped.

Very rapid.

"They moved at a splitting pace."

Severe.

"I have a splitting headache."