adularia
/ˌadjʊˈlɛːrɪə/ /ˌadʒʊˈlɛːrɪə/Mineralogy
noun
A potassium feldspar that occurs in schists (notably in the Swiss Alps), often with a distinctive opalescence, and is now regarded as a variety of orthoclase.
Origin
Late 18th century; earliest use found in The Critical Review. From Italian adularia from Adula, the name of an area of the Alps east of the St Gotthard Pass + -ia, with insertion of -r- apparently for euphony.
- off the beaten track
- off the beaten track (or path)
- off the bit (or bridle)
- off the boat
- off-the-course
- off the cuff
- off-the-face
- off the grid
- off the grog
- off the hook
- off-the-job
- off the map
- off the pace
- off the peg
- off-the-plan
- off the rack
- off the record
- off-the-road
- off the scale
- off the shelf
- off the shoulder
- off the top of one's head
- off the wall
- off the wind
- off time