N. rosta- v. “to hollow out, excavate” (Category: to Dig, Delve)
A verb in The Etymologies of the 1930s appearing in its [Noldorin] infinitive form rosto, glossed “to hollow out, excavate” and derived from the root ᴹ√ROD “cave” (Ety/ROD). Likely its primitive form was *rod-tā, where d+t became st in ancient Elvish.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. tumla- {“dig a hole, excavate” >>} “excavate, hollow out” (GL/72), likely derived from the early root ᴱ√TUM(B)U having to do with hollow things, as suggested by Christopher Tolkien (LT1A/Tombo; QL/095).
References ✧ Ety/ROD
Inflections
| rosto | infinitive | “to hollow out, excavate” | ✧ Ety/ROD |
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| ON. rostóbe > rosto | [rosta-] | ✧ Ety/ROD |
G. tumla- v. “to excavate, hollow out” (Category: to Dig, Delve)
References ✧ GL/72; LT1A/Tombo
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