Final answer:
To pluralize a medical term that ends in 'a', replace 'a' with 'ae' for the plural form, although some terms may also take the anglicized '-s' or '-es' endings.
Step-by-step explanation:
To pluralize a medical term that ends in a, you generally change the a to ae. For example, the plural of bacterium is bacteria. This rule originates from Latin where ae is a common ending for plural nouns.
However, some medical terms have been anglicized, allowing for a more regular English plural with -s or -es. For instance, 'amoeba' can be pluralized as 'amoebas' in addition to the Latin 'amoebae'. It's important to be aware of the specific term usage within the medical community.