Learn how to say Inarch correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word inarch:
[with object] Horticulture
graft (a plant) by connecting a growing branch without separating it from its parent stock:
this infestation can be countered by inarching a tolerant rootstock
early 17th century (formerly also as enarch): from en-1, in-2 ‘into’ + the verb arch1