Etymology

gram-positive

Today it means: That is stained violet by Gram's method Full definition →

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gram-positive · adjective1

From Gram (“a surname”) + positive, after Danish bacteriologist Hans Christian Gram, who invented the Gram staining method.

Gram-positive · adjective2

From Gram (“a surname”) + positive, after Danish bacteriologist Hans Christian Gram, who invented the Gram staining method.

Etymology from Wiktionary, CC BY-SA 4.0.