pla·ti·na 
(plə-tēnə)
(plə-tēnə)n.
Platinum, especially as found naturally in impure form.
[Spanish, diminutive of plata, silver, plate, from Vulgar Latin *plattus; see PLATE.]
- on the outs
- on the part of
- on the prowl
- on the qui vive
- on the rack
- on the rag
- on-the-record
- on the right foot
- on the road
- on the rocks
- on the ropes
- on the run
- on the same wavelength
- on-the-scene
- on the shelf
- on the side
- on the sly
- on the spectrum
- on the spot
- on the square
- on the street
- on the strength of
- on the string
- on the surface
- on the table