Ph.D. /ˈpiːˌeɪ̯t͡ʃˈdiː/ noun2 •Doctor of Philosophy, a terminal research degree, the highest of academic degrees conferred by a college or university.Ph.D’s will go to Kirk G. Rasmussen and Val Hicks. — 1971 •(informal) A person who holds a Ph.D. degree.There are 12 Ph.D’s in the Concordia faculty of 62, according to Dr. P. A. Zimmerman, President, with others nearing the completion of doctorate requirements. — 1961 formsPh.D's · Ph.D.'s · Ph.D.s