culm: stem of plants of the Gramineae
stalk: a slender or elongated structure that supports a plant or fungus or a plant part or plant organ
pelvic inflammatory disease: inflammation of the female pelvic organs (especially the Fallopian tubes) caused by infection by any of several microorganisms (chiefly gonococci and chlamydia); symptoms are abdominal pain and fever and foul-smelling vaginal discharge