adjective (often lowercase)
Origin of Gram-negative
Examples from the Web for gram-negative
The latter are Gram-negative, and vary greatly in both dimensions as well as in form.
The bacillar threads are in places Gram-negative, in others Gram-positive, and bear small club-like swellings (see Fig. 14).
This method is excellent for differentiating Gram-positive and Gram-negative organisms on the same slide.
The Gram-positive bacteria are violet and the Gram-negative are red.
The organism is a short, thick diplobacillus, is frequently intracellular, and is Gram-negative (Fig. 126).A Manual of Clinical Diagnosis|James Campbell Todd