a small blood vessel

blood vessel

an apparatus producing a rush of water into the air; a source or origin

source, often of liquid

a hole made in the ground from which coal etc is taken; of, belonging to, me

deposit, supply

an amount or supply (of something) kept for use when needed, e.g. food, facts, information etc; a large shop selling many different goods

collection, supply

stratum

layer

a layer of rock etc in the ground; a social class or division

layer