sphragistics（n.）
英 [sfrə'dʒɪstɪks] 美 [sfrə'dʒɪstɪks]
"the study of seals," 1831, from Latinized form of Greek sphragtistikos, "of, for, or pertaining to a seal," from sphragis "seal. impression of a seal, signet," a word of unknown origin. Related: Sphragistical.
该词起源时间：1831年