How to spell “trade( )mark” in English

Anna Ronkainen,

If you find the correct spelling of “trademark” confusing – one word or two, and does someone really spell it with a hyphen? – here’s a quick reference:

via (a number of English-speaking countries are missing because their industrial property offices are not online)

At Onomatics, we prefer “trademark” because we are used to togetherspelling of compoundwords.