Word Study
arecidae
CIDE DICTIONARY
arecidae, n.
one of four subclasses or superorder of Monocotyledones; comprises about 6400 species in 5 families of trees and shrubs and terrestrial herbs and a few free-floating aquatics including: Palmae; Araceae; Pandanaceae: and Lemnaceae. [WordNet 1.5]
For further exploring for "arecidae" in Webster Dictionary Online