Wiktionary
n. 1 (context gaming English) A unit of damage, used to specify the amount of damage a character can withstand before it is defeated. 2 (context computer graphics English) In ray tracing, the point in a scene at which a ray strikes an object.
Usage examples of "hit point".
It's not everybody who gets hit point-blank with a bazooka shell and lives to tell about it.
It has an AC of 4 and 10 hit points, which do not count against the demon shark's hit point total.
The pen, like a small spear, hit point first and rattled into the bottom of the metal pail.
If either one takes even one hit point of damage, it will explode in a 20' radius, doing 6-36 hp damage to anyone in the area.
The shapechanger had managed to kill both Mona the woman warrior, and the Conan-jock, and Diefenbaker had been so badly hurt in the rescue attempt that he was down to one hit point, and his healing spells were used up.
But I must have thrown four hundred of the things, varying my grip slightly each time, until I got one to hit point first.