An etymology is the history of a linguistic form, such as a word; the same term is also used for the study of word histories. A dictionary etymology tells us what is known of an English word before it became the word entered in that dictionary. If the word was created in English, the etymology shows, to whatever extent is not already obvious from the shape of the word, what materials were used to form it. If the word was borrowed into English, the etymology traces the borrowing process backward from the point at which the word entered English to the earliest records of the ancestral language.