craniofacial physiology trait Trait.ontology Any measurable or observable characteristic related to the function of or processes in the region of the body that includes the front part of the head from the chin to the top of the forehead, where the mouth, eyes, nose, and other features are and the part of the skull enclosing the brain. 2009-08-28T01:52:47Z VT:0015027 smb head physiology trait