How is a compound word defined?

A compound word is defined as a word that is formed by combining two or more whole words, which come together to create a new meaning that is usually related to the meanings of the individual words. For example, the word "toothbrush" is a compound word made up of "tooth" and "brush," which collectively refer to a tool used for cleaning teeth. This definition emphasizes the construction of the word from distinct, complete words, highlighting its nature as a building block of language that conveys a specific idea more efficiently than the separate words might alone.

The other options refer to different concepts. A medical abbreviation is a shortened form of a word or phrase commonly used in healthcare settings to streamline communication, while a term used in pharmacology relates specifically to the science of drugs and their effects. A single word with a complex meaning suggests a different type of vocabulary that does not require the combination of separate words. Understanding the structure of compound words is essential for effective communication and enhances vocabulary development, particularly in specialized fields like healthcare where precise language is crucial.