late 14c., from Latin supplementum "that which fills up, that with which anything is made full or whole, something added to supply a deficiency," from supplere "to fill up" (see supply (v.)).
supplement (v.)
1829, from supplement (n.). Compare Spanish suplementar. Related: Supplemented; supplementing.
supplement your diet
Vitamins supplemented his meager diet
supine
supper
suppertime
supplant
supple
supplement
supplemental
supplementary
suppliant
supplicant
supplicate