Noah Webster
Decompound
DECOMPOUND', verb transitive
1. To compound a second time; to compound or mix with that which is already compound; to form by a second composition.
2. To decompose.
DECOMPOUND', adjective
1. Composed of things or words already compounded; compounded a second time.
2. A decompound leaf, in botany, is when the primary petiole is so divided that each part forms a compound leaf. A decompound flower is formed of compound flowers, or containing, within a common calyx, smaller calyxes, common to several flowers.