What Is the Plural of Bacterium: Is It Bacteria or Bacteriums?

You’ve probably heard both bacteria and bacterium, maybe even bacteriums. They show up in science class, medical news, and casual conversations.

Using the wrong form might not crash a conversation, but it can definitely confuse readers and listeners. Especially in education, research, and journalism, word accuracy matters.

So let’s settle the debate with facts, examples, and real grammar rules.