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

Language evolves, but science loves precision. When you’re talking about the tiny living things under a microscope, you need to be exact. One of the most common questions in scientific writing and everyday speech is:

What is the plural of bacterium? Is it bacteria or bacteriums?

Let’s break it down.

Why This Question Matters
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.

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