1. 
   Blastoid
   Blastoids were a class of echinoderms that were very common during the Mississippian period (about 360 to 325 million years ago). These extinct, nut-shaped animals had spiny skin and radial symmetry. They had a stem which held the calyx (cup), which was topped with bristle-like arms.
   Found op http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
   
   
2. 
   Blastoid
   Blas'toid noun (Zoology) One of the Blastoidea.
   Found op http://www.encyclo.co.uk/webster/B/63
   
   
3. 
   blastoid
   <zoology> One of the Blastoidea. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?blastoid
   
   
4. 
   Blastoid
   • (n.) One of the Blastoidea.
   Found op http://thinkexist.com/dictionary/meaning/blastoid/
   
   
5. 
   blastoid
   any member of an extinct class (Blastoidea) of echinoderms, animals related to the modern starfish and sea lilies, that existed from the Middle ... [4 related articles]
   Found op http://www.britannica.com/eb/a-z/b/77
   
   
6. 
   Blastoid
   Blastoids (Class Blastoidea) are an extinct type of stemmed echinoderm. Often called sea buds, blastoid fossils look like small hickory nuts. They originated, along with many other echinoderm classes, in the Ordovician period and reached their greatest diversity in the Mississippian subperiod of th...
   Found op http://en.wikipedia.org/wiki/Blastoid
   
   
7. 
   blastoid
   A cell that has undergone blastogenesis, which is the transformation of a functionally dormant cell to an active cell. A blastoid cell is characterized by expansion of the cytoplasm and enlargement of the cell nucleus.
   Found op http://www.daviddarling.info/encyclopedia/B/blastoid.html
   
   

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