This noun follows the standard English plural rule: simply add -s to the singular form.
Mastoid is regular. It follows the Standard -s rule.
Use plural verbs: "The mastoids are ready" (not "is ready").
Yes. The plural mastoids is standard across all English variants.
The word mastoid follows the standard English pluralization rule. When forming the plural, mastoid becomes mastoids. This follows the Standard -s pattern, which is one of the most common plural rules in English.
Understanding why mastoid becomes mastoids helps with spelling and pronunciation. This noun follows the standard English plural rule: simply add -s to the singular form.
When using mastoids in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The mastoids are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.