Nouns ending in -a (often Latin or scientific) add -e to form the plural.
Pneumonia is regular. It follows the -ae Addition rule.
Use plural verbs: "The pneumoniae are ready" (not "is ready").
Yes. The plural pneumoniae is standard across all English variants.
The word pneumonia follows the standard English pluralization rule. When forming the plural, pneumonia becomes pneumoniae. This follows the -ae Addition pattern, which is one of the most common plural rules in English.
Understanding why pneumonia becomes pneumoniae helps with spelling and pronunciation. Nouns ending in -a (often Latin or scientific) add -e to form the plural.
When using pneumoniae in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The pneumoniae are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.