1.3.4.2 Nouns
Exactly the opposite problem is caused by examples such as scissors and trousers, which appear to be nouns which lack a singular form (*scissor, *trouser). This might be more of a semantic problem rather than a grammatical one however, as the objects to which these words refer are inherently plural in some respect: scissors have two blades and trousers have two legs. Moreover, without this plural aspect to the meaning, the object ceases to be describable in the same way: something with one blade cannot be described as scissors (or scissor for that matter) and something with one leg is not trousers (nor trouser). Again, it is possible to find the singular form of such words used, though in very limited contexts. When two nouns are put together to form a single compound noun, the preceding noun must be in its singular form: