3. (Her.) An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.
Diadem lemur. (Zoöl.) See Indri. -- Diadem spider (Zoöl.), the garden spider.
Di"a*dem, v. t. To adorn with a diadem; to crown.
Not so, when diadem'd with rays divine.
Pope.
To terminate the evil,
To diadem the right.
R. H. Neale.
Di"a*drom (?), n. [Gr. &?; a running through; dia` through + &?;, used as inf. aor. of &?; to run.] A complete course or vibration; time of vibration, as of a pendulum. [Obs.] Locke.
{ Di*ær"e*sis, Di*er"e*sis } (?; 277), n.; pl. Diæreses or Diereses (#). [L. diaeresis, Gr. &?;, fr. &?; to divide; dia` through, asunder + &?; to take. See Heresy.] 1. (Gram.) The separation or resolution of one syllable into two; -- the opposite of synæresis.
2. A mark consisting of two dots [], placed over the second of two adjacent vowels, to denote that they are to be pronounced as distinct letters; as, coöperate, aërial.