anadem
A headband, especially a garland of flowers.
Ada, on the grass, kept trying to make an anadem of marguerites for the dog while Lucette looked on, munching a crumpet.
Where it comes from
From Latin anadēma, from Ancient Greek ἀνάδημα (anádēma, “head-band”).
Adapted from the Wiktionary entry anadem (CC BY-SA 4.0).