pycnaspidean
/ˌpɪknəˈspɪdɪən/Ornithology. Now rare
adjective
In suboscine passerine birds: having or designating a tarsus whose rear surface is covered with small scales.
Origin
Late 19th century; earliest use found in The Century Dictionary. From Pycnaspideae or its etymon scientific Latin Pycnaspideae + -an.