autotun Noun, n, autotun

1. self-propelled artillery, locomotive artillery

Appox. usage (any sense): less than 0.1 per million words

autorapid Noun, n, autorapid

1. high-speed self-propelled train car

Appox. usage (any sense): less than 0.1 per million words

autopropulsor Adjective, autopropulsor

1. self-propelled

Appox. usage (any sense): less than 0.1 per million words