The Collaborative International Dictionary
Semiplume
Semiplume \Sem"i*plume`\ (s[e^]m`[i^]*pl[=u]m), n. (Zo["o]l.) A feather which has a plumelike web, with the shaft of an ordinary feather.
Wiktionary
semiplume
n. (context zoology English) A feather which has a plumelike web, with the shaft of an ordinary feather.