Noun

1. a small ball of chemical pesticide and deodorant placed in or around clothing and other articles susceptible to damage from mold or moth larvae in order to protect them from this damage; mothballs have either naphthalene or paradichlorobenzene as their active ingredient.

Verb

1. to store or shelve (something that is no longer used)

   They mothballed the old version after the new one came out.