The medical specialty concerned with the diagnosis, management and nonsurgical treatment of diseases, especially of internal organ systems.

A reddish-orange colour used to set things apart from their surroundings, especially in the aerospace industry.

(literary theory) A psychological conflict that is internal to a character. / (by extension) Mental struggle arising from competing feelings, desires, impulses, etc.

plural of internalizer

One who, or that which, internalizes.

plural of international reply coupon

A prepaid international postage voucher.

(uncountable) The condition of being internal or internalized. / (countable) A thing that is internal relative to something else.

Alternative form of internal combustion engine

plural of internal rhyme