Prefix: sub-

Define this word: substitute

• to replace

• below zero on the Fahrenheit scale; very cold

• a ship that can go under water

• underground electric railway

• beneath the ground

Define this word: subzero

• to replace

• below zero on the Fahrenheit scale; very cold

• a ship that can go under water

• underground electric railway

• beneath the ground

Define this word: submarine

• to replace

• below zero on the Fahrenheit scale; very cold

• a ship that can go under water

• underground electric railway

• beneath the ground

Define this word: subway

• to replace

• below zero on the Fahrenheit scale; very cold

• a ship that can go under water

• underground electric railway

• beneath the ground

Define this word: subterranean

• to replace

• below zero on the Fahrenheit scale; very cold

• a ship that can go under water

• underground electric railway

• beneath the ground

What does the prefix "sub-" mean?

• again

• one

• under; below

• before

Choose the word that best completes this sentence:

My mom told me I need to put my coat on because of the __________ temperatures outside.

• substitute

• subzero

• submarine

• subway

• subterranean