| the basinlike cavity in the lower part of the trunk of many vertebrates, formed in humans by the innominate bones, sacrum, etc. |
| the flat, movable bone at the front of the knee; kneecap. |
critical crit·i·cal (krĭt'ĭ-kəl)
adj.
Of or relating to a medical crisis.
Being or relating to a grave physical condition especially of a patient.
Of or relating to the value of a measurement, such as temperature, at which an abrupt change in a chemical of physical quality, property, or state occurs.