形容詞 retral:

1. moving or directed or tending in a backward direction or contrary to a previous direction
   同義詞：retrograde
2. at or near or toward the posterior

re.tral

adj.（形容詞）
Situated at, located close to, or directed toward the back.
在后面的，接近后面的：處于、接近或朝向后部的
Backward; reverse.
向后的，倒退的

來(lái)源：
From Latin retrô [back] * see re-
源自 拉丁語(yǔ) retrô [后面的] *參見(jiàn) re-

【引伸】
re.trally
adv.（副詞）