Which term describes rod-shaped bacteria?

The term that describes rod-shaped bacteria is "Bacillus." This classification is used in microbiology to categorize bacteria based on their shape, and bacillus specifically refers to those that have an elongated, rod-like structure. Bacilli can be found in various environments and can have important roles in processes like decomposition and nutrient cycling.

In contrast, cocci refers to spherical-shaped bacteria, spirilla are spiral or corkscrew-shaped, and vibrio describe a comma-shaped or curved appearance. Each of these terms serves to identify distinct morphological features of bacteria, making it essential for classification and understanding their characteristics and behaviors in different contexts. Thus, bacillus accurately matches the description of rod-shaped bacteria.