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