I see that the Oxford Dictionary and Merriam Webster both have this as a closed compound. However, would it be considered acceptable to spell it with a hyphen: "micro-organisms"?


  • Hi @norwegianblue. Yes, as with all hyphenated or closed/open forms, this is a matter of style, and neither is ‘more correct’ than the other. We show the most common form (and the general trend is for compound nouns to be given without hyphens). However, it is perfectly acceptable to give the form micro-organism. This was actually the more common form in the past, as shown by the example quotations in the OED entry:

Sign In or Register to comment.