comet

名词 comet:

1. (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

1. Their memory wasn't very good when it came to recalling other things, but they remembered the comet.
   一谈到别的事情时，他们的记性并不是很好，但他们却记得彗星。
2. If I had binoculars, I could see that comet clearly.
   如果我有望远镜，我就可以清楚地看见那颗彗星。
3. A comet is at perihelion when it is closest (=very close) to the sun.
   彗星最接近太阳时，它就是在近日点。
4. Comets move around the sun like planets, but in long oval course.
   彗星象行星一样绕太阳运转，然而其轨道呈狭长的椭圆形。

com.et

n.（名词）
A celestial body, observed only in that part of its orbit that is relatively close to the sun, having a head consisting of a solid nucleus surrounded by a nebulous coma up to 2.4 million kilometers (.5 million miles) in diameter and an elongated, curved vapor tail arising from the coma when sufficiently close to the sun. Comets are thought to consist chiefly of ammonia, methane, carbon dioxide, and water.
彗星：一种天体，仅能在它比较接近于太阳的那一部分轨道才能看到，有一个包括固体核、由直径达到两千四百万公里（一千五百万英里）的星云状的彗发围绕的头部 ，当足够接近太阳时一个拉长的曲线气尾从彗发升起。人们认为彗星主要有氨、甲烷、二氧化碳和水构成

来源：
Middle English comete
中古英语 comete
from Old English comôta
源自 古英语 comôta
from Latin
源自 拉丁语
from Greek (astôr) komôtôs [long-haired (star)]
源自 希腊语 (astôr) komôtôs [长发的（星）]
from komô [hair]
源自 komô [头发]

【引伸】
com.etar.y
<注释>Comets have been feared throughout much of human history,and even in our own time their goings and comings receive great attention.Perhaps a comet might seem less awesome if we realized that our name for it is based on a figurative resemblance between it and human beings.This figurative name is recorded first in the works of Aristotle,in which he useskomô, the Greek word for .hair of the head,. to mean .luminous tail of a comet.. Aristotle then uses the derived wordkomôtôs, .wearing long hair,. as a noun meaning .comet.. The Greek word was adopted into Latin ascomôtôs, which was refashioned in Late Latin and given the formcomôta, furnishing Old English with comôta, the earliest English ancestor of our wordcomet.
在大多数人类历史期间，人们害怕彗星，甚至在我们自己的时代彗星的到来与离去仍受到很大注意。如果我们认识到我们对它的名字是基于它和人在外形上的相似性，也许彗星看起来就不太可怕了。比喻的名字首先记录在亚里士多德的著作中，他使用的kome 是希腊语中意为.头发.的词，表示.彗星明亮的尾巴。 然后亚里士多德使用导出的单词kometes .戴长发.，作为名词意义的.comet.。 希腊单词被采用到拉丁语为cometes， 它再形成晚期拉丁语，给定形式为cometa， 以 cometa 的形式出现于老式英语， 这就是我们单词comet 的最早英语原形