gladiolus
Concise Oxford English Dictionary © 2008 Oxford University Press:
gladiolus /ˌgladɪˈəʊləs/
▶noun (pl. gladioli /-lʌɪ/ or gladioluses) a plant of the iris family with sword-shaped leaves and spikes of brightly coloured flowers. [Genus Gladiolus.]
– origin OE (orig. denoting the gladdon), from L., dimin. of gladius ‘sword’.
'gladiolus' also found in these Oxford entries:

