Microorganism
Microbe
noun
You've learned 微 can mean "delicate," but it can also mean tiny. Combine that with 生物, which you might remember is "living thing," and what do you get? A tiny living thing…? Well, that's a microorganism. The tiniest kind of living thing there is.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
このお化けのような形の微生物は「ミジンコ」です。
This ghostly shaped microorganism is "Daphnia magna."
微生物学の専門家は何時に来る予定ですか。
What time is the the microbiology specialist scheduled to come?
ミソって実は、微生物の働きによって作られているんですよ。
Miso is actually made through the activity of microorganisms.
門田さんは二年前まで微生物の心を読み取る研究をしていました。
Mr. Kadota had been researching on reading the minds of microbes until two years ago.