milímetro
/miˈlimetɾo/ · B2 · noun · m
millimeter
📏 milímetro = mili (thousandth) + metro (meter): a thousandth of a meter
Mili- comes from Latin mille, meaning thousand, and metro means meter. So milímetro is literally a 'thousandth-meter'. The same mili- shows up in English words like millennium and millipede.