burr 3 also bur 
(bûr)
(bûr)n.
A washer that fits around the smaller end of a rivet.
[Middle English burre, ring, disk, alteration of burwhe, circle, disk.]
- thermometer
- thermometric
- thermometry
- thermomotor
- thermonuclear
- thermoperiodicity
- thermoperiodism
- thermophile
- thermophilic
- thermopile
- thermoplastic
- thermoplasticity
- Thermopylae
- thermoreceptor
- thermoregulate
- thermoregulation
- thermoregulatory
- thermoremanent magnetization
- thermos
- thermosetting
- thermosphere
- thermospheric
- thermostabile
- thermostability
- thermostable