adjective

existing in a material or physical form; not abstract.

concrete objects like stones

solid,material,real,physical,tangible,touchable,tactile,palpable,visible,existing

noun

a building material made from a mixture of broken stone or gravel, sand, cement, and water, which can be spread or poured into moulds and forms a mass resembling stone on hardening.

slabs of concrete

verb

cover (an area) with concrete.

the precious English countryside may soon be concreted over