noun. any spherical or nearly spherical bacteria.
- true bacteria
Example sentences of the word cocci
1. Noun, singular or mass
The tetrad occurs in a subgroup of the cocci where the bacterium divides in two planes to form a square of four bacteria called a tetrad.
Diplococci are cocci arranged in pairs; streptococci are found in chains.
3. Noun, plural
Rods and cocci are most common.