gram-negative

adjective
gram-neg·​a·​tive | \ˈgram-ˈne-gə-tiv \

Definition of gram-negative 

: not holding the purple dye when stained by Gram's stain used chiefly of bacteria

First Known Use of gram-negative

1907, in the meaning defined above

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The first known use of gram-negative was in 1907

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gram-negative

adjective
gram-neg·​a·​tive | \ˈgram-ˈneg-ət-iv \

Medical Definition of gram-negative 

: not holding the purple dye when stained by Gram's stain used chiefly of bacteria

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