Made half of a metal and half of some other material.

(physics) Of or relating to a half-metal.

Happening hourly, but at 30 minutes past each hour; ie, 08:30, 09:30 etc. / Happening on the hour and at 30 minutes after the hour. / (soccer) At thirty minutes into a half.

The onager.

Poorly or incompetently done. / desultory

simple past tense and past participle of half-ass

Produced in an incompetent or desultory manner, or of something lacking in quality or substance; of low rank; incompetent.

(slang) To perform a task incompletely or carelessly. Usually considered derogatory or insulting.

plural of half hitch

(knots) A knot or hitch made by passing the end of the rope once around the standing part or other rope.