|a scrap or morsel of food left at a meal.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
operant op·er·ant (ŏp'ər-ənt)
Operating to produce effects; effective.
Of, relating to, or being a response that occurs spontaneously and is identified by its reinforcing or inhibiting effects.