Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm. Often called sea buds, blastoid fossils look like small hickory nuts. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may ...
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http://en.wikipedia.org/wiki/Blastoid
• (n.) One of the Blastoidea.
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http://thinkexist.com/dictionary/meaning/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]
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http://www.britannica.com/eb/a-z/b/77
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.
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http://www.daviddarling.info/encyclopedia/B/blastoid.html
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.
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Blas'toid noun (Zoology) One of the Blastoidea.
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http://www.encyclo.co.uk/webster/B/63
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