invigorant noun 1adjective 1forms 1 noun1 •Something that invigorates.CONCENTRATED PHOSOGEN, absolutely pure, the most perfect nervous invigorant in the world, for physicians' and druggists' use, in pound flasks; $5 each, per dozen $40. — 1869 adjective1 •(no longer used) Synonym of invigorating.Cases requiring invigorant, tonic treatment will respond gratefull to the use of Elixir Kola Comp. — 1894 formsinvigorants