tornado
Concise Oxford English Dictionary © 2008 Oxford University Press:
tornado /tɔːˈneɪdəʊ/
▶noun (pl. tornadoes or tornados) a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud.
– derivatives
tornadic /-ˈnadɪk/ adjective.
tornadic /-ˈnadɪk/ adjective.
– origin C16: perh. an alt. of Sp. tronada ‘thunderstorm’, by assoc. with Sp. tornar ‘to turn’.
'tornado' also found in these Oxford entries:

