h₂erk-tó-

“held back, enclosed”

Widely acceptedcontainmentboundary

arctic, ark, arcane, coerce

Participial of *h₂erk- giving Latin arcēre > coerce, Greek arktos > arctic, English ark, arcane.‍‍‌‌‍‍‍‍‌‍‍‌‍‍‌‍‍‍‌‍‌‌‌‌‌‍‍‍‍‌‍‍

dʰwer-yo-“pertaining to doors, of the threshold”h₂erǵ-₃“to close, shut, confine”h₂erk-“to hold, contain, guard”h₂erk-mn̥-“an enclosure, contained space”ḱenk-eyo-“to keep girding, binding around”terh₁-mn̥-“a boundary, limit, end-point”terh₁-sko-“to cross over a threshold”