I. Mars /mɑːz $ mɑːrz/ BrE AmE noun
the small red ↑ planet that is fourth in order from the Sun and is nearest the Earth ⇨ Martian :
the enormous volcanoes known to exist on Mars
II. ˈMars Bar BrE AmE ( also Mars ) trademark
a popular type of chocolate bar with a centre made of soft ↑ nougat and ↑ caramel . Mars Bars are sold in the UK and the US, but American Mars Bars also have ↑ almond s in them. An old advertisement for Mars Bars used to say that ‘A Mars a day helps you work, rest, and play’.