1. Designed to activate or move or regulate itself
   - self-acting, self-activating, self-regulating

See also: automatic

• trailer park trash
• trailer trash
• trailer truck
• trailhead
• trailing
• trailing arbutus
• trailing edge
• trailing four o'clock
• trailing windmills
• train
• train depot
• train dispatcher
• train fare
• train of thought
• train oil
• train set
• train station
• train ticket
• train wreck
• trainable
• trainband
• trainbandsman
• trainbearer
• trained
• trained nurse