noun cac·to·blas·tis \ˌkaktəˈblastə̇s\

Definition of cactoblastis

  1. 1 capitalized :  a genus of small moths (subfamily Phycitinae of the family Pyralidae) native to South America including the cactus moth (C. cactorum) which has been introduced into Australia to control prickly-pear infestation

  2. 2 plural cactoblastes \-ˌtēz\ :  cactus moth

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of cactoblastis

New Latin, from cactus + -o- + -blastis -blast

First Known Use: 1931

Seen and Heard

What made you want to look up cactoblastis? Please tell us where you read or heard it (including the quote, if possible).


to cast off or become cast off

Get Word of the Day daily email!