Select the most appropriate one-word substitution for the given group of words. 

Trees whose leaves fall every autumn 

Deciduous

The most appropriate one-word substitution for "trees whose leaves fall every autumn" is deciduous.

• Floral refers to flowers.
• Interlude is a short break or interruption.
• Expatriate refers to a person who lives in a foreign country.

The word deciduous comes from the Latin word "decidere," meaning "to fall down." Deciduous trees lose their leaves every autumn, and grow new leaves in the spring. Some common deciduous trees include maples, oaks, and birches.