Etymology
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spirillum (n.)

(plural spirilla), 1875, Modern Latin, diminutive of Latin spira (see spiral (adj.)). So called for their structure.

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Definitions of spirillum

spirillum (n.)
spirally twisted elongate rodlike bacteria usually living in stagnant water;
spirillum (n.)
any flagellated aerobic bacteria having a spirally twisted rodlike form;
Synonyms: spirilla
From wordnet.princeton.edu