[ 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for heterostracan