The brand name is "BAND-AID" according to: http://www.band-aid.com/index2.html

The brand name has one, but I think using it as a generic term, you can choose whether you use a hyphen or not.

Both are correct. If you are referring to the original brand then one would spell it as BAND-AID and if you are referring to a generic version of the product then one would spell it as band aid.

1) Bob Geldorf's supergroup is correctly spelled Band Aid. The brand of adhesive bandage is correctly spelled Band-Aid. If used as a generic name for an adhesive bandage, there could be alternative spellings like band-aid or bandaid. 2) "Band Aid may refer to: Band Aid (band), a musical ensemble raising money for famine relief "Band Aid", a song on Pixie Lott's album Turn It Up Band-Aid, a brand of adhesive bandage A generic name for an adhesive bandage in America" Source and further information: http://en.wikipedia.org/wiki/Band_Aid Further information: http://en.wikipedia.org/wiki/Band-Aid http://en.wikipedia.org/wiki/Band_Aid_(band%29 3) "band-aid Alternative spellings bandaid Band-Aid - Etymology Trademark Band-Aid registered 1924 by Johnson & Johnson. Sense of a temporary solution 1968, Canada. - Noun band-aid (plural band-aids) 1. (capitalized, trademark) A particular brand of adhesive bandage. 2. (North American) An adhesive bandage, a small piece of fabric or plastic that may be stuck to the skin in order to temporarily cover a small wound. 3. (North American) A temporary or makeshift solution to a problem, created ad hoc (often used with a negative connotation of a lack of foresight) 1968, United Church Observer, n 15 (March), p 36: It was another of those political band-aids patted over a minor sore." Source and further information: http://en.wiktionary.org/wiki/band-aid

What is a hypen? Is there such a word?