Here are some examples:
* Hemisphere: Half of a sphere
* Hemicycle: Half of a circle
* Hemoglobin: A protein in red blood cells that contains iron and carries oxygen throughout the body (the "hemo" part refers to the iron-containing part of the molecule).
* Hemicrania: Headache on one side of the head.
While "hemi-" directly translates to "half", it's important to note that it doesn't always mean exactly half in every instance. It often refers to a part that is roughly half or significantly less than the whole.