(medicine) A symptom of severe phosphorus poisoning in which stools (feces) laden with phosphorus are passed.

(medicine) A chart (and associated scale) that classifies human faeces, with limited use as a diagnostic aid.

plural of Bristol stool chart

Not fitting neatly into either of two categories or positions. / Used other than figuratively or idiomatically: see between, two, stool.

(medicine) Bristol stool chart

plural of Bristol stool scale

(idiomatic, of tasks, issues, problems, items) To fit into neither of two categories and, hence, be neglected or fail.

Unable to fit into either of two conflicting categories, and as a result likely to fail.

simple past tense of fall between two stools

past participle of fall between two stools