The Collaborative International Dictionary
Castlebuilder
Castlebuilder \Cas"tle*build`er\, n. Fig.: one who builds castles in the air or forms visionary schemes. -- Cas"tle*build`ing, n.
Wiktionary
castlebuilder
n. 1 One who builds castle in the air; one who forms visionary schemes. 2 ''Synallaxis albescens'', a bird that constructs a spherical nest of sticks.