Sentence:  <WSD>"Isinglass</WSD>".—This is procured from the "air-bag" or "swimming-bladder", sometimes termed the "sound", of various fishes. ... Sometimes the bag is dried unopened, as in the case of the "purse", "pipe", and "lump" <WSD>isinglasses</WSD> of the shops. At other times it is laid open, and submitted to some preparation; being either dried unfolded, as in the "leaf" and "honeycomb" <WSD>isinglasses</WSD>; or folded, as in the "staple" ("long" and "short") and "book" <WSD>isinglasses</WSD>; or rolled out, as in the "ribbon" <WSD>isinglass</WSD>. 
Meaning of the word marked with <WSD> tags:  A form of gelatine obtained from the air bladder of the sturgeon and certain other fish, used as an adhesive and as a clarifying agent for wine and beer.