The term 'Dorsum' is a Latin word meaning 'BACK'. It is commonly used in anatomy to refer to the posterior surface of the body, or the BACK. In zoology, it is used to refer to the upper surface of an animal's body, such as the BACK of a fish or the dorsal fin of a whale. In botany, it is used to refer to the upper surface of a leaf or petal. The crossword solution for the term 'Dorsum' is 'BACK', which is a four-letter word.