Protozoan

Part of speech: noun

Pronunciation: /ˌpɹəʊ.təˈzəʊ.ən/

Definitions

1. A single-celled microscopic organism that typically lives in water and moves using structures like cilia or flagella
2. A microscopic, single-celled organism known for living in aquatic environments and exhibiting movement through appendages such as cilia or flagella
3. This organism, recognizable by its unicellular structure, often inhabits water and has the ability to move via cilia, flagella, or pseudopodia

Etymology: "Protozoan" is a technical coinage built from Greek roots, and its name tells you what the organisms were thought to be. The Greek "prōtos" means "first" and "zōion" means "animal," so the term describes the first animals. The idea behind it was that these tiny, single-celled creatures stood at the very beginning of the animal kingdom, simpler than anything with many cells. The word was formed in Modern Latin as "Protozoa," the plural name for this group, and English took it from there. The English noun "protozoan" is simply that Latin group name turned into a singular, with the suffix "-an" added in the same way as in words like "human" or "Lutheran," so that one creature from the group could be named on its own.

Synonyms: single-celled organism, microbe