lep·to·spi·ro·sis \ˌ ̷ ̷ ̷ ̷ˌspīˈrōsə̇s\noun (pluralleptospiro·ses \-ōˌsēz\) Etymology: New Latin, from Leptospira + -osis : any of several diseases of man and domestic animals (as cattle and dogs) caused by infection with spirochetes of the genus Leptospira — see stuttgart disease, weil's disease; compare canicola fever