SINCE 1828
agnathan
noun
ag·na·than
| \
ˈag-nə-thən
\
\
plural agnathans
Definition of agnathan
: jawless fish Two jawless fishes (agnathans) are recognized in these fossils … based on differences in the shape and histology of their tubercles … —Moya Meredith Smith, Science, 18 Jan. 1991
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