Elementary (A2)
IPA: /ˈkjuːbɔɪd/
KK: /ˈkjuːbɔɪd/
Definition
Having a shape that is similar to a cube, with six rectangular faces.
Example
The box was cuboid, making it easy to stack with other boxes.
Conversation

I just bought this new storage box that’s really cuboid in shape.

That sounds cool! Is it big enough for all your stuff?

Yeah, it fits perfectly into the corner because it's so cuboid.

Nice! I love when things are both functional and stylish.
Synonyms & Antonyms
Antonyms
spherical
cylindrical
irregular
Definition
A three-dimensional shape with six rectangular faces, also known as a rectangular box.
Example
The box was shaped like a cuboid, making it easy to stack with others.
Conversation

Have you ever seen a cuboid shape in real life?

Yeah, I saw one in my math class during a 3D modeling lesson.

It's so interesting how cuboid shapes are everywhere around us.
Root Explanation
Cuboid is formed from "cubus" (from Latin, meaning cube) and "-oid" (from Greek "eidos", meaning form or shape). The word describes a three-dimensional shape that resembles a cube.
Memory Tip
Think of a 'cube' ('cubus') and remember that 'cuboid' refers to a shape that is similar to a cube.
Visually Confused Words
ceboid
cubi
columboid
colubroid
clubionid
boid