The vowel combination “ae” appearing at the terminus of a word is a relatively uncommon occurrence in modern English. Examples include biological terms like algae and amoebae (plural forms of alga and amoeba, respectively), or archaic spellings like encyclopaedia. These words often have Greek or Latin roots.
Retention of this vowel combination reflects the etymology of these terms and often signals a technical or scientific context. Understanding the origins of these spellings can provide valuable insights into the meaning and evolution of the words themselves. The use of “ae” versus the simplified “e” can sometimes distinguish between American and British English spelling conventions, as in the case of encyclopedia (American) and encyclopaedia (British). This distinction highlights the continuing influence of classical languages on English vocabulary.