galtzairu

• altzairu (Standard)
• kaltzairu (Biscayan)

From the same source of altzairu, but with excrescent g-.

galtzairu inan

1. (dialectal, Navarro-Lapurdian) alternative form of altzairu

• “galtzairu”, in Euskaltzaindiaren Hiztegia [Dictionary of the Basque Academy] (in Basque), Euskaltzaindia [Royal Academy of the Basque Language]
• “galtzairu”, in Orotariko Euskal Hiztegia [General Basque Dictionary], Euskaltzaindia, 1987–2005
• R. L. Trask (2008) “galtzairu”, in Max W. Wheeler, editor, Etymological Dictionary of Basque, University of Sussex, page 196