thyrealn.

/ˈθʌɪəriːəl/Etymology: < Greek θŭρεός shield: see thyro- comb. form.
Ichthyology.
the world > animals > fish > parts of fish > [adjective] > having specific type of gills > situated under
18.. Starks 518 (Cent. Supp.).
This entry has not yet been fully updated (first published 1912; most recently modified version published online June 2018).