tomato

English tomato comes from earlier tomate, borrowed from Spanish tomate, which came from Classical Nahuatl tomatl, tracing back to Proto-Nahuan *toma-tl.

The word passed from Nahuatl into Spanish as tomate, then into English, where the spelling shifted slightly to tomato.

It's a close relative of tomatillo, which comes from the same Nahuatl root with a Spanish diminutive ending attached.