lapid-, lapis-

(Latin: stone, rock)

lapilliform
lapis
lapis lazuli
Omnem movere lapidem.
1. To move every stone.
2. To leave no stone unturned.

"Keep trying" or do the very best in an enterprise or project.

Stillicidi casus lapidem cavat.
Dripping moisture hollows out a stone.

Also translated as: "Slow and steady does it."

Related "stone, rock" word families: litho-; petro-; saxi-; stele-.