Gram-negative bacillus
Technical term in bacteriology; refers to rod-shaped bacteria that do not retain the crystal violet stain in the Gram staining procedure.
Gram-negative bacilli are a group that includes E. coli and Pseudomonas aeruginosa.
Gram-positive bacillus; retains the crystal violet stain, unlike Gram-negative bacilli.
From グラム (Gram, after Hans Christian Gram) + 陰性 (negative) + 桿菌 (bacillus). A modern scientific compound.