supplementary
adj.
1660s, "added as something extra," from supplement, n. + -ary. Suppletory in the same sense is from 1620s.
| 词汇 | supplementary | 
| 词根词缀 | Online Etymology Dictionary supplementary adj. 1660s, "added as something extra," from supplement, n. + -ary. Suppletory in the same sense is from 1620s. | 
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