An instrument for scraping mud etc. from the boots.

plural of bootscraper

sole of a boot

plural of bootsole

(usually in the plural) bootlace

plural of bootstring

A machine learning ensemble meta-algorithm designed to improve the stability and accuracy of machine learning algorithms used in statistical classification and regression.

Capable of being bootstrapped.

plural of boots (servant who cleans and blacks the boots and shoes)

plural of bootstep