A device used to scratch the head. / (informal) Something particularly puzzling or confusing.

(idiomatic) An admonition to oneself to calm down when overly excited, especially in terms of romantic attraction.

Alternative form of be still my heart

(idiomatic, informal) A dimwit, a fool / A melon-headed whale

Industrial processes that are very complex or involve large and heavy equipment, facilities, or end products.

(slang) A psychiatrist or psychotherapist; a shrink. / (literally) One who shrinks heads, as previously done by some Amazon tribes.

(medicine) A syndrome marked by weakness, edema and shortness of breath, due to the inability of the heart to circulate the blood adequately to the lungs and other tissues.

Former name for the bird Prunella modularis, the dunnock.

Protective headgear worn by a construction worker; a hard hat.

A major division of the Department of Health and Human Services dedicated to promoting the public health of the United States.