Definition of "diadema" [diadema]

• A genus of (noun)
• The typical genus of sea-urchins of the family Diadematidæ. D. mexicanus and D. sctosum are examples. (noun)
• A genus of nymphalid butterflies. (noun)
• A genus of (noun)

The Century Dictionary (Public Domain)

• "A population discovered at Tsinjoarivo in 1999, originally thought referable to P. diadema, is morphologically distinctive and might represent a new species."
• "This species resembles Calamaria diadema, which is also found in Western"
• "The kagu is the national bird of New Caledonia and is listed by IUCN as endangered (EN), along with the Australasian bittern (Botaurus poiciloptilus), New Caledonian lorikeet (Charmosyna diadema), and New Caledonian owlet-nightjar (Aegotheles savesi)."