(cycling) The toughest category of climbs, tougher than category 1. One of six categories of climbs, HC, 1, 2, 3, 4, and not classified; not classified being the easiest.

(anatomy) A tubule in the nephron in the kidney that goes to the pelvis. Its primary function is to bring urine to the pelvis of the kidney.

A form of communication that combines the elements of advertising and entertainment.

thyrotomy