in ‧ fan ‧ try /ˈɪnfəntri/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Language: French ; Origin: infanterie , from Old Italian infanteria , from infante 'boy, soldier' , from Latin infans ; ⇨ ↑ infant 1 ]
soldiers who fight on foot:
an infantry regiment
⇨ ↑ cavalry