名詞 palindrome:

1. a word or phrase that reads the same backward as forward

pal.in.drome

n.（名詞）
A word, phrase, verse, or sentence that reads the same backward or forward. For example:
回文：正讀、反讀都相同的一個單詞、詞組、詩節(jié)或句子，例如：
例句：
A man, a plan, a canal, Panama!
一個人、一個計劃、一個運河、巴拿馬!

A segment of double-stranded DNA in which the nucleotide sequence of one strand reads in reverse order to that of the complementary strand.
回文結構：含有雙股脫氧核糖核酸的一部分，其中的核苷酸系列的一股顛倒順序來讀取即為互補的一股

來源：
From Greek palindromos [running back again, recurring]
源自 希臘語 palindromos [又跑回來，再發(fā)生]
palin [again] * see k wel-
palin [重新] *參見 k wel-
dromos [a running]
dromos [跑步]

【引伸】
pal.indro.mic