We don't have synonyms for watch glasses yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are watch glass and water glasses.
(n) :
(chemistry) An item of glass laboratory equipment consisting of a simple, slightly concave circle of glass. It is a general utility item, used to hold small samples, to evaporate liquids, to cover a beaker, and so on.
(n) :
(chemistry) An item of glass laboratory equipment consisting of a simple, slightly concave circle of glass. It is a general utility item, used to hold small samples, to evaporate liquids, to cover a beaker, and so on.