supplemental adjective & noun. [sʌplɪ'mɛnt(ǝ)l] E17.
[formed as SUPPLEMENT verb + -AL¹.]
A. adjective. = SUPPLEMENTARY adjective. Foll. by to, of. Now chiefly US. E17.
supplemental chord Math. either of two chords which join any point on a circle to the two end-points of any diameter.
b. noun. A supplementary fact etc. rare. L17.

■ supplementally adverb M18.

[TahlilGaran] English Dictionary ▲