Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
Litmus is regular. It follows the -es Addition rule.
Use plural verbs: "The litmuses are ready" (not "is ready").
Yes. The plural litmuses is standard across all English variants.
The word litmus follows the standard English pluralization rule. When forming the plural, litmus becomes litmuses. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why litmus becomes litmuses helps with spelling and pronunciation. Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
When using litmuses in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The litmuses are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.