1. (noun) 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)

• karl popper
• sir karl raimund popper

1. (noun) 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)

• philosopher

2. (noun) a container of stimulant drug (amyl nitrate or butyl nitrite)

• excitant
• stimulant
• stimulant drug

3. (noun) a container for cooking popcorn

• cooker

1. (noun) a container for cooking popcorn

• pop