In botany, a caryopsis (plural caryopses) is a type of simple dry fruit — one that is monocarpellate (formed from a single carpel) and indehiscent (not opening at maturity)  and resembles an achene, except that in a caryopsis the pericarp is fused with the thin seed coat.
The term grain is also used in a more general sense as synonymous with cereal (as in "cereal grains", which include some non-Poaceae). Considering that the fruit wall and the seed are intimately fused into a single unit, and the caryopsis or grain is a dry fruit, little concern is given to technically separating the terms "fruit" and "seed" in these plant structures. In many grains, the "hulls" to be separated before processing are actually flower bracts.
- "Caryopsis". Merriam Webster. Retrieved 31 August 2014.
- "caryopsis". Encyclopedia Britannica. Encyclopedia Britannica. Retrieved 31 August 2014.