To adorn with or as if with a diadem; crown.
noun.
In embryology, a term applied to certain eggs in the blastula stage.
noun.
Anciently, a head-band or fillet worn by kings as a badge of royalty.
noun.
Anything worn on the head as a mark or badge of royalty; a crown.
noun.
Figuratively, supreme power; sovereignty.
noun.
In heraldry, one of the arches which rise from the rim or circle of a crown, and support the mound or globe at the top.
noun.
In zoology, a certain monkey, Cercopithecus diadematus.