Wiktionary
gram-negative
a. (context medicine of a bacterium English) that is not stained violet by Gram's method alt. (context medicine of a bacterium English) that is not stained violet by Gram's method
WordNet
gram-negative
adj. (of bacteria) being or relating to a bacterium that does not retain the violet stain used in Gram's method [ant: gram-positive]
Usage examples of "gram-negative".
Jones down fifteen points, Federated Confidence up three, incoming briefing on causal decoupling of social control of skirt hem lengths, shaving pattern of beards, and emergence of multidrug antibiotic resistance in Gram-negative bacilli: Accept?
It was found to contain a previously unknown form of unicellular organism, coccobacillary in shape, gram-negative, coagulase, and triokinase-positive.