Eudicotyledonous

Part of speech: adjective

Definitions

1. A class of flowering plants distinguished by the presence of two cotyledons, which often display characteristics like netted leaf venation and floral structures typically arranged in fours or fives
2. This category encompasses plants that develop two initial leaves at germination, commonly exhibiting features such as reticulated leaf patterns and flowers in sets of four or five
3. Plants characterized by producing two embryonic seed leaves, showing features such as branching leaf veins and flowers with parts usually in multiples of four or five

Etymology: "Cotyledon" comes from Greek "kotylēdōn," meaning "cup-shaped hollow," which is what the first leaves of a seedling look like as they cradle the embryo. "Dicotyledon" adds "di-" for two, so a dicot is a plant whose embryo has two such seed leaves. The prefix "eu-" is Greek for "well" or "true." Botanists attached it once they found that the traditional dicots were not a single natural family tree. Molecular studies showed that some dicot lineages, such as magnoliids and other early-diverging flowering plants, branch off earlier than the rest. The eudicots are the monophyletic group that remains after those lineages are set aside, so the term marks out a subset of dicots, not all of them. The word is therefore a modern scientific compound, built from classical parts, that names a clade rather than an older folk category. Its meaning depends on the relationships that phylogenetic analysis revealed.