'Tonsils' is a word borrowed from Latin 'tonsillae'. The word entered the English language some time around 1601.
tonsils [noun] [1601]
- either of a pair of prominent masses of lymphoid tissue that lie one on each side of the throat between two folds of so...
- any of various masses of lymphoid tissue (as the adenoids) that are similar to
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Etymology: Latin 'tonsillae' plural, tonsils
See more loan words from 1600s.