Dicots or Dicotyledons are flowering plants who have seeds that have two embryonic leaves (cotyledons). Flowering plants that are not dicots are monocots or monocotyledons.
It should be noted here that dicots are not a monophyletic group. We have placed them in the Class Magnoliopsida in accordance with the Cronquist system and to help us work them into the existing taxonomy as seen here. However, it should be noted that the APGII system shows they are not monophyletic. Most “dicots” are in a monophyletic group called the eudicots (tricolpates), but some are not. To make things easy for looking at the resulting orders, we have simply grouped all Dicots in this taxonomic rank.