A single-seeded, dry, non-dehiscent fruit in which pericarp is united with seed is known as
 

Caryopsis is a dry indehiscent single seeded fruit with a fused pericarp and seed coat. Since it is single seeded it develops from a monocarpellary gynoecium.

Achene is a dry indehiscent fruit in which the pericarp is free from the seed coat.

Cypsela is a type of indehiscent dry fruit in which the fruit wall is free from the seed.

A Loment is a dry fruit of certain leguminous plants, such as the tick trefoil, having constrictions between the seeds and separating at maturity into one-seeded segments.