I. Mars /mɑːz $ mɑːrz/ 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

[TahlilGaran] Dictionary of Contemporary English ▲

II. ˈMars Bar (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 almonds in them. An old advertisement for Mars Bars used to say that ‘A Mars a day helps you work, rest, and play’.

[TahlilGaran] Dictionary of Contemporary English ▲