1.  popper(n = noun.person) karl popper, sir karl raimund popper - British philosopher (born in Austria) who argued that scientific theories can never be proved to be true, but are tested by attempts to falsify them (1902-1994);
is a kind of philosopher

2.  popper(n = noun.artifact) - a container of stimulant drug (amyl nitrate or butyl nitrite);
is a kind of excitant, stimulant, stimulant drug

3.  popper(n = noun.artifact) - a container for cooking popcorn;
is a kind of cooker
Derived form verb pop₁₂

   A utensil for popping corn, usually a wire basket with a long handle. [1913 Webster]

   A dagger. Chaucer. [1913 Webster]

popper, n.
1 Brit. colloq. a press-stud.
2 a person or thing that pops.
3 colloq. a small vial of amyl nitrite used for inhalation.