A microorganism, especially a disease-causing bacterium (noun)
Looking for the answer to the USA Today Rootonym clue “A microorganism, especially a disease-causing bacterium (noun)”? The solution is MICROBE, a 7-letter word built on the root MICRO (“small”). It appeared in the September 12, 2026 (Saturday) USA Today Rootonym. See the full puzzle for that day's other words.
Answer
MICROBE
MICRO**MICROmeans “small”
In a sentence
The MICROBE caused health issues for the elderly man who had little resistance to illness.
About this clue
The Rootonym clue “A microorganism, especially a disease-causing bacterium (noun)” has the answer MICROBE (7 letters), built on the root MICRO, which means “small”. Browse the full September 12, 2026 Rootonym puzzle for the other three words, or see all Rootonym answers.