We found 2 dictionaries that define the word slip sill:

General (1 matching dictionary)

1. slip sill: Merriam-Webster

Business (1 matching dictionary)

2. Construction Term Glossary (No longer online)

▸ Words similar to slip sill ▸ Usage examples for slip sill ▸ Idioms related to slip sill ▸ Wikipedia articles (New!) ▸ Words that often appear near slip sill ▸ Rhymes of slip sill ▸ Invented words related to slip sill