资料来源 : pyDict

三字铭,三线形,象

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Trigram \Tri"gram\, n. [Pref. tri- + -gram.]
   Same as {Trigraph}.

资料来源 : WordNet®

trigram
     n : a word that is written with three letters in an alphabetic
         writing system