The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
swd-
DEFINITION:
Sweet, pleasant. Oldest form *swe2d-, colored to *swa2d-, contracted to *swd-.1.sweet, from Old English swte, sweet, from Germanic *swtja-.2. Suffixed form *swd--.suasion; assuasive, dissuade, persuade, from Latin sudre, to advise, urge (< recommend as good). 3. Suffixed form *swd-wi-.soave, suave; assuage, from Latin suvis, delightful. 4. Suffixed form *swd-es-.aedes, from Greek dos, pleasure. 5. Suffixed form *swd-on.hedonic, hedonism, from Greek hdon, pleasure. (Pokorny sd- 1039.)