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[het-uh-ros-truh-kuh n] /ˌhɛt əˈrɒs trə kən/
noun, Paleontology.
any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body enclosed in bony plates.
Origin of heterostracan
< New Latin Heterostrac(i) (plural) name of the order, equivalent to heter- heter- + Greek ostrak(ón) (singular) shell + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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