One who, or that which, ejects or dispossesses. / (mechanics) A jet jump for lifting water or withdrawing air from a space.

A bench in a grade school's public area meant for a child on free time in need of someone to talk with, and whoever joins him there for that reason.

present participle of start the ball rolling

(genetics) A genomic evolutionary rate profiling score that measures the evolutionary conservation of a particular genetic sequence across species