plural of horn-piper

plural of pied piper

plural of uilleann piper

The person paying for something is the one who gets to say how it should be done

Alternative form of who pays the piper calls the tune

(organic chemistry, pharmacology, uncountable) A saturated heterocyclic compound, C₄H₁₀N₂, containing two nitrogen atoms in a six-membered ring; it is used as an anthelmintic.

(organic chemistry) An alicyclic heterocycle, containing 5 carbon atoms and one nitrogen atom, formally derived by the hydrogenation of pyridine; many of its derivatives are alkaloids or pharmaceuticals

(organic chemistry) Any of three isomeric compounds derived from piperidine by substituting a carbonyl for a methylene group

plural of piperidine

plural of piperidone