System Glossary
 Glossary Search for spectacle (Search Options)

Definition of Term

spectacle
(english) A transparent membrane covering the eye. Petromyzontidae have a primary spectacle that is an unattached modification of the cornea while other fishes may have a secondary spectacle formed from skin originally fused to the cornea and subsequently separated. The secondary spectacle is found in fish that live in habitats with abrasive substrates or in fish with protruding eyes that require some streamlining.

Other Search Engines

European Environment Agency Glossary of the European Environmental Agency
Wikipedia The Free Encyclopedia
Encyclopedia Britannica Highly authoritative source
EPA Terms Glossary of the U.S. Environmental Protection Agency
LingInfo Glossary of biological terms
Google Search The largest Internet Search Engine
Google Image Search for Images related to the term
Glossary Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Back to Search
Update Glossary Entry | Add Glossary Entry
Back to Top