# undercrust

> English word · Noun

## Definitions
1. A crust that forms the bottom of a pie, tart or other dish; a layer of pastry that supports the filling.
2. The layer of material located beneath the crust of a planet or moon.

## Etymology
under- + crust

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/undercrust