Mesohyl

Part of speech: noun

Definitions

1. The jelly-like substance located between sponge cells provides structural integrity and helps in nutrient transport
2. This connective tissue-like matrix within sponges aids in cellular interactions and waste removal processes
3. A gelatinous and supportive layer inside sponges that lies between the outer and inner cell layers and facilitates transport and structural support

Etymology: Sponges are built around a gel-like middle layer that sits between their outer skin and inner lining, and the term for that jelly borrows a Greek word meaning "matter" or "wood." The first half, "meso-," is the Greek for "middle," so the name simply describes something lying in the centre of the body. The second half comes from Ancient Greek "húlē," which could mean timber or raw material, and it is the same root that gave English "hyle," the philosophical term for matter in its unformed state. The pairing is a modern scientific coinage built from classical parts rather than a word that Greek writers used for sponges. Its earliest record in English is given by the Oxford English Dictionary, which lists it with a 2006 reference, so the word is a technical term of comparatively recent standing in biology.