(anatomy) any hollow cylindrical body structure

a microscopically small tubule

any of the small tubules that are the excretory units of the vertebrate kidney

a tubule that drains excess aqueous humor

any of the numerous long convoluted tubules in the testis which are the sites where spermatozoa mature

the several highly convoluted tubules that lead from the rete testis to the vas deferens and form the head of the epididymis