Shaped like or resembling a coccus, which is a spherical bacterium.
From coccus (Latin, from Greek kokkos meaning berry) plus -oid (resembling) plus -al (relating to). The term evolved to describe the characteristic round shape of certain bacteria under microscopes.
Doctors use 'coccoidal' to describe dangerous bacteria like Streptococcus, which are literally ball-shaped and stack together like tiny grapes—their shape is actually a clue to how they cause infections.
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