plectrum [plectrums](music: small piece for plucking strings) noun [UK: ˈplek.trəm] [US: ˈplek.trəm]
нейромедиаторnoun {m}
neurotransmitter [neurotransmitters](substance responsible for sending nerve signals across a synapse between two neurons) noun [UK: ˈnjʊə.rəʊ.trænz.mɪ.tə(r)] [US: ˈnjʊəro.ʊ.trænz.mɪ.tər]