Medical Definition of head
1: the division of the human body that contains the brain, the eyes, the ears, the nose, and the mouth; also : the corresponding anterior division of the body of various animals including all vertebrates, most arthropods, and many mollusks and worms
3: a projection or extremity especially of an anatomical part: asa: the rounded proximal end of a long bone (as the humerus)b: the end of a muscle nearest the originc: the anterior end of an invertebrate : scolex
4: the part of a boil, pimple, or abscess at which it is likely to break
5: the end of a lipid molecule that consists of a polar group and is regarded as being opposite to the tail
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