Dictionary.com
Thesaurus.com

gladiolus vs. gladiola

[glad-ee-oh-luhs] / ˌglæd iˈoʊ ləs /

noun

PLURAL

gladiolus, gladioli, gladioluses, gladioli.
  1. any plant of the genus Gladiolus, of the iris family, native especially to Africa, having erect, sword-shaped leaves and spikes of flowers in a variety of colors.

  2. Anatomy.  the middle and largest segment of the sternum.

[glad-ee-oh-luh] / ˌglæd iˈoʊ lə /

noun

  1. gladiolus.