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