Resembling a berry or sphere in shape; referring to spherical or nearly spherical microorganisms like certain bacteria or cocci.
From Greek 'kokkos' (berry) + '-oid' (resembling). The term has been used in microbiology since the 19th century to describe the morphology of round bacterial cells.
When you see a strep throat diagnosis mentioning 'streptococcus' bacteria, you're seeing this 'coccoid' principle at work—these spherical bacteria arrange themselves in chains, visible as tiny pearl-like structures under electron microscopes.
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