cavalletti
noun
cav·al·let·ti ˌka-və-ˈle-tē 
variants or less commonly cavaletti
plural in form but singular or plural in construction
: a series of timber jumps that are adjustable in height for schooling horses
Word History
Etymology
borrowed from Italian, plural of cavalletto "trestle, stand," from cavallo "horse" (going back to Latin caballus "work horse, gelding") + -etto, diminutive suffix — more at cavalcade
First Known Use
1950, in the meaning defined above