Tiny Organisms First Observed by Van Leeuwenhoek

This page is the CodyCross answer for the clue below from Medieval Times, Group 229, Puzzle 3 (Dante Alighieri).

Question is: Tiny Organisms First Observed by Van Leeuwenhoek

and the answer is: BACTERIA

Word Meaning:

BACTERIA — plural of bacterium

Definitions from Wiktionary.