flagstones is a form of:

Flagstone



noun
1.
(flat stone slab, esp. used for pavement) ផ្ទាំងថ្ម (សម្រាប់ក្រាលផ្លូវដើរក្នុងសួនជាដើម)
ENGLISH MEANING
noun
1.
A flat stone used in paving, or any rock which will split into such stones.