Sentence:  This has an interesting analogy with the assumption stated by Philippoff that `` the deformational mechanics of elastic <WSD>solids</WSD> can be applied to flowing solutions '' . 
Meaning of the word marked with <WSD> tags:  the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape