league of nations: an international organization formed in 1920 to promote cooperation and peace among nations; although suggested by Woodrow Wilson, the United States never joined and it remained powerless; it was dissolved in 1946 after the United Nations was formed
phenylalanine: an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body