Caryopsis

Part of speech: noun

Definitions

1. A specific fruit type featuring a tough outer layer that contains a single, inseparably attached seed within it
2. A botanical category highlighting a seed integrated with its protective layer, prevalent in various types of grains and grasses
3. A botanical fruit that consists of a seed fused with its outer pericarp, commonly found in cereals and certain grasses

Etymology: Caryopsis is a New Latin coinage from Greek roots: "karyon" meaning nut or kernel, and "opsis" meaning appearance or aspect. Taken together it means something like "nut-like appearance," a name that fits the seed-and-fruit fusion it describes. The word is a technical botanical term, built deliberately rather than inherited from ancient usage, so the Greek roots show the intent of its makers without any older sense of the word behind them. The "kernel" in its make-up is the key to the picture. In a grain such as wheat, rice or barley, the fruit wall fuses tightly around the single seed, so the two cannot be pulled apart. The fruit looks like a small nut from the outside, and the name records that impression. Botanists who needed a single term for this structure reached back to the Greek word for a nut's kernel and gave it a descriptive suffix.