n. 回文, 回文结构

[化] 回文对称; 旋转对称

[ noun ]
a word or phrase that reads the same backward as forward
<noun.communication>

Palindrome \Pal"in*drome\, n. [Gr. pali`ndromos running back
again; pa`lin again + dramei^n to run: cf. F. palindrome.]
A word, verse, or sentence, that is the same when read
backward or forward; as, madam; Hannah; or Lewd did I live, &
evil I did dwel.