"the hills of the fairies," 1793; but in Yeats, "the fairie folk" (1899), ellipsis of Irish (aos) sidhe "people of the faerie mound" (compare second element in banshee).
sidetrack
sidewalk
side-way
sideways
sidewinder
Sidhe
siding
sidle
Sidon
SIDS
Sieg Heil
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