der Eiswürfel
ice cube
A small, usually cube-shaped block of frozen water used to cool drinks.
Ich hätte gerne eine Cola mit Zitrone und zwei Eiswürfeln.
I'd like a Coke with lemon and two ice cubes.

ice cube
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ice cube
A small, usually cube-shaped block of frozen water used to cool drinks.
Ich hätte gerne eine Cola mit Zitrone und zwei Eiswürfeln.
I'd like a Coke with lemon and two ice cubes.

This word is a simple compound made from 'Eis' (ice) and 'Würfel' (cube). So it literally means 'ice in the shape of a cube'.
Für den Cocktail brauchen wir noch Eiswürfel.
We still need ice cubes for the cocktail.
'Eiswürfel' (ice cube) is almost always used in connection with drinks. A typical question in a restaurant is: 'Möchten Sie Ihr Getränk mit oder ohne Eiswürfel?' (Would you like your drink with or without ice cubes?)
Einen Orangensaft, bitte, aber ohne Eiswürfel.
An orange juice, please, but without ice cubes.
Common combinations are 'Eiswürfel in ein Glas geben' (to put ice cubes into a glass), 'ein Getränk mit Eiswürfeln bestellen' (to order a drink with ice cubes), or 'Eiswürfel machen' (to make ice cubes, in the freezer).
Kannst du bitte noch ein paar Eiswürfel ins Wasser geben?
Can you please put a few more ice cubes in the water?
ice / ice cream
'das Eis' and 'der Eiswürfel' both have to do with frozen water. 'Eis' is the general substance: water has become solid and cold. 'Eiswürfel' are small pieces of ice, usually for drinks. Learners may confuse the words because in everyday life, people often briefly say 'Eis' when talking about drinks. More precisely, however: there are ice cubes in the glass, and there is ice on the lake.

Für die Limonade legt Tom drei Eiswürfel ins Glas.
For the lemonade, Tom puts three ice cubes into the glass.
Nach der kalten Nacht war das Eis auf dem Teich sehr dick.
After the cold night, the ice on the pond was very thick.