Dutch word zendmast comes from Dutch mast, Dutch zenden

Detailed word origin of zendmast

Dictionary entry	Language	Definition
mast	Dutch (nld)	Mast, fodder for pigs or other animals made up of acorns and beechnuts. Mast.
zenden	Dutch (nld)	(intransitive, communications) to transmit. (transitive) to send.
zendmast	Dutch (nld)	Transmitter tower, radio mast.

Words with the same origin as zendmast