名詞 fossil:

1. someone whose style is out of fashion
   同義詞：dodo, fogy, fogey
2. the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil

形容詞 fossil:

1. characteristic of a fossil

1. Coal is a fossil fuel.
   煤是一種礦物燃料。
2. He found a piece of fossil of an ancient bird.
   他發(fā)現(xiàn)一塊古代鳥類的化石。

fos.sil

n.（名詞）
A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the earth`s crust.
化石：埋置并保存于地層中的古生物遺體、遺物和其生活遺址，如骨骸、葉子的印痕等
One, such as a rigid theory, that is outdated or antiquated.
過時(shí)的或廢棄的事物，如僵化的理論
Linguistics
【語言學(xué)】
A word or morpheme that is used only in certain restricted contexts, askempt in unkempt, but is otherwise obsolete.
舊詞：只用于某種限定的上下文中的詞或語素，如kempt in unkempt 。在別處已廢棄不用
An archaic syntactic rule or pattern used only in idioms, asso be it.
古語法：一種只用于習(xí)語中的古體句法規(guī)則和句型，如so be it
adj.（形容詞）
Characteristic of or having the nature of a fossil.
化石性的：化石性的，有化石特性的
Being or similar to a fossil.
類似化石的：化石的，類似化石的
Belonging to the past; antiquated.
過時(shí)的，陳舊的：屬于過去的；廢棄的

來源：
From Latin fossilis [dug up]
源自 拉丁語 fossilis [掘起，挖出]
from fossus [past participle of] fodere [to dig]
源自 fossus [] fodere的過去分詞 [挖，掘（土）]