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