os·tra·cod

[os-truh-kod]
noun

Origin:
1860–65; < Neo-Latin Ostracoda name of the subclass < Greek ostrakṓdēs, equivalent to óstrak(on) shell, tile (see ostracize) + -ōdēs -ode1

os·tra·co·dan [os-truh-kohd-n] , os·tra·co·dous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
ostracod (ˈɒstrəˌkɒd) [Click for IPA pronunciation guide]
 
n
any minute crustacean of the mainly freshwater subclass Ostracoda, in which the body is enclosed in a transparent two-valved carapace
 
[C19: via New Latin from Greek ostrakōdēs having a shell, from ostrakon shell]
 
ostracodan
 
adj
 
ostra'codous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Ostracod is always a great word to know.
So is ort. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a scrap or morsel of food left at a meal.
Encyclopedia Britannica
Encyclopedia

ostracod

any of a widely distributed group of crustaceans resembling mussels. Mussel shrimp differ from most crustaceans in having a very short trunk that has lost its external segmentation, or divisions. Nearly all of the body is encased in a hard covering, or carapace. The 2,000 living species include marine, freshwater, and terrestrial forms

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fragmented shells of freshwater molluscs and an ostracod occur within a marlstone bed.
Additional variation in ostracod species richness was further explained by water and sediment depth.
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