cornerstone, foundation stone
礎 centers on the fundamental base that supports everything above: a cornerstone or foundation stone that provides stability and structure.
礎 combines 石 (stone) with 楚, which likely contributes the sound ソ and may carry an idea of a base or foundation. The exact historical development of 楚 in this context is uncertain.
The left side is a stone 石, and the right side 楚 looks like a structure being built. Picture a large stone placed first as the cornerstone, with the rest of the building rising from it.
For ソ, imagine laying a cornerstone so perfectly that it makes a soft, satisfying 'so' sound as it settles into place: so -> ソ.
foundation; basis
foundation stone; cornerstone
laying a cornerstone (foundation stone)
foundation stone; cornerstone
Communication Science Laboratories
pillar of state
basic training; practicing the basics
to lay the foundation for (e.g. a theory); to lay the basis for
basal metabolism
basal metabolic rate; BMR
basal body temperature
skin-care products
basic medicine
groundwork; solidifying the fundamentals; training of the basics
fundamental academic skills; expected basic knowledge (of a subject)
bed rock; foundation rock
foundation works
foundation engineering
basic pension
universal pension number; common number shared between different pension schemes; basic pension number