sitz bath(n = noun.artifact) hip bath - a bathtub in which your buttocks and hips are immersed as if you were sitting in a chair and you bathe in a sitting position;
is a kind of bath, bathing tub, bathtub, tub

   A tub in which one bathes in a sitting posture; also, a bath so taken; a hip bath. [1913 Webster]

bath, bath asparagus, bath chair, bath linen, bath mat, bath mitzvah, bath oil, bath powder, bath salts, bath soap, bath towel, bath water, bubble bath, hip bath, mud bath, short-stop bath, shower bath, sponge bath, steam bath, stop bath, sweat bath, swimming bath, turkish bath, vapor bath, vapour bath, water bath, whirlpool bath