shelleryn.
Etymology: < shell n. n.1 + -ery suffix.Previous versions of the OED give the stress as: ˈshellery.
1737 M. Delany (1861) I. 608 I have been to see Lady Walpole's shellery (for grotto I will not call it).
This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2019).