のみならず details
not only ... but also (written)
この技術は医療のみならず、農業にも応用されている。
kono gijutsu wa iryou nomi narazu, nougyou ni mo ouyou sarete iru.
This technology is applied not only in medicine but in agriculture as well. neutral
彼は理論に詳しいのみならず、現場の経験も豊富だ。
kare wa riron ni kuwashii nomi narazu, genba no keiken mo houfu da.
He is not only well versed in the theory — he has plenty of experience on the ground. neutral
- alternant
Examples
not only X but also Y — denies that the list stops at X, in written or formal register
この技術は医療のみならず、農業にも応用されている。
kono gijutsu wa iryou nomi narazu, nougyou ni mo ouyou sarete iru.
This technology is applied not only in medicine but in agriculture as well. neutral
彼は理論に詳しいのみならず、現場の経験も豊富だ。
kare wa riron ni kuwashii nomi narazu, genba no keiken mo houfu da.
He is not only well versed in the theory — he has plenty of experience on the ground. neutral
本事業は当社のみならず、地域全体に利益をもたらすものと考えております。
honjigyou wa tousha nomi narazu, chiiki zentai ni rieki o motarasu mono to kangaete orimasu.
We believe this project will benefit not only our company but the region as a whole. formal
Formation
{N}のみならずattaches to nounplain clause + のみならず（な-adjは であるのみならず）attaches to plain clause
Variant notes
- のみでなく — swaps the classical ならず for the modern でなく — same written register, much rarer, and like のみならず it still wants も on the second item.
Related patterns
Similar
One meaning zone split by register — だけでなく is neutral and dominates speech, while のみならず keeps the classical negative ならず and belongs to editorials, reports and academic prose; spoken, it sounds like a quotation.
のみならず keeps the classical ならず and stays written/literary (essays, reports); に限らず attaches only to nouns, while のみならず also takes whole clauses (詳しいのみならず) — so a clause needing "not only" reaches for のみならず regardless of register.
はもとより presents X as too obvious to argue and hangs off a noun only; のみならず makes no such appeal to the obvious and takes whole clauses as readily as nouns — which is why reports reach for のみならず and blurbs for はもとより.
Lookalikes
Shares のみ and reverses it — のみ closes the set to exactly N (会員のみ shuts everyone else out), while のみならず reopens it and obliges a second member (会員のみならず一般の方も).