Definition from Wiktionary, the free dictionary
chaplet (plural chaplets)
- A garland or circlet for the head.
- A string of beads, especially when making up five decades of the rosary.
- A moulding in the form of a string of beads; a bead-moulding.
- A small chapel or shrine.
Derived terms 
A garland or circlet for the head
A moulding in the form of a string of beads; a bead-moulding