What is the proper way to write this term when writing product documentation? Hyphenated or not?
drop down list
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In the dictionary it's drop-down: http://www.merriam-webster.com/dictionary/drop-down
Also "drop-down" prevails on tech websites like apple.com or microsoft.com.
I think that this is the best indicator: http://books.google.com/ngrams/graph?content=drop-down%2C+drop+down&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=
In the Merriam Webster dictionary, it is drop-down, but it also shows dropdown. — http://www.merriam-webster.com/dictionary/drop-down "drop-down or dropdown noun, plural drop-downs or dropdowns "