The Collaborative International Dictionary
Pycnaspidean
Pycnaspidean \Pyc`nas*pid"e*an\, a. [Gr. ? thick, crowded + ?, ?, a shield.] (Zo["o]l.) Having the posterior side of the tarsus covered with small irregular scales; -- said of certain birds.
Wiktionary
pycnaspidean
a. (context zoology of birds English) Having the posterior side of the tarsus covered with small irregular scales.