Sentence:  <WSD>Semipositive</WSD> molds are more expensive to manufacture and maintain than the other types, but they are much better from an applications point of view. 
Meaning of the word marked with <WSD> tags:  A type of compression mold for plastics that allows for excess powder and flash, as in an open flash mold, but which allows for lower melt viscosities as in a fully positive mold.