-ery BrE AmE ə r i —This stress-neutral suffix is used only after a strong-vowelled syllable (ma ˈ chinery); after a weak-vowelled syllable the variant -ry ri is used instead ( ˈ dentistry).
-ERY
Meaning of -ERY in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012