The plural of "louse" is "lice." Lice spread diseases such as typhus. Lice cannot survive for long if removed from their host. Some words do not form their plurals by adding 's' to the end but by changing their forms (e.g., man becomes men, foot becomes feet, tooth becomes teeth). Are You Good at Plurals? Here's a quick test. plural of cello celles
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plural of louse
