A pebble is a small one (5)
I believe the answer is:
stone
(Other definitions for stone that I've seen before include "Small rock" , "Imperial unit of weight" , "Rock; fruit seed" , "See 21" , "diamond, say" .)
I believe the answer is:
stone
(Other definitions for stone that I've seen before include "Small rock" , "Imperial unit of weight" , "Rock; fruit seed" , "See 21" , "diamond, say" .)