Zoogloea

Part of speech: noun

Definitions

1. A jelly-like mass formed when bacterial cells cluster together and become enclosed in a shared slimy matrix they secrete
2. A gelatinous colony of microorganisms held together within a common sticky substance that they produce themselves
3. The slimy clump of bacteria encased in a secreted gel, a form many microbes take when they aggregate on surfaces

Etymology: Zoogloea is a modern scientific coinage, built from two Greek pieces: "zoo-", from "zōion" meaning "animal" or "living being", and "gloia", meaning "glue" or "sticky substance". The result describes a mass of bacteria held together in a shared gelatinous matrix. The Greeks themselves never used the word, so its literal sense is "living glue" or "animal glue", a name that reflects how the organisms look when they cluster together. The "zoo-" element is the same one that gives English "zoology" and "zoo", and its Greek ancestor goes back to a word for "alive" that also shaped "zodiac", the band of animal-shaped star signs. The second element, "gloia", is attested in classical Greek for glue and resin-like stickiness, which is why the term fits the slimy films that bacteria produce. The word therefore pairs an ancient vocabulary with a modern meaning: the bacteria are not animals, and the "animal" in the name is a leftover from how early naturalists sorted living things into broad groups.