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