名詞 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.
   一談到別的事情時(shí)，他們的記性并不是很好，但他們卻記得彗星。
2. If I had binoculars, I could see that comet clearly.
   如果我有望遠(yuǎn)鏡，我就可以清楚地看見(jiàn)那顆彗星。
3. A comet is at perihelion when it is closest (=very close) to the sun.
   彗星最接近太陽(yáng)時(shí)，它就是在近日點(diǎn)。
4. Comets move around the sun like planets, but in long oval course.
   彗星象行星一樣繞太陽(yáng)運(yùn)轉(zhuǎn)，然而其軌道呈狹長(zhǎng)的橢圓形。

com.et

n.（名詞）
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：一種天體，僅能在它比較接近于太陽(yáng)的那一部分軌道才能看到，有一個(gè)包括固體核、由直徑達(dá)到兩千四百萬(wàn)公里（一千五百萬(wàn)英里）的星云狀的彗發(fā)圍繞的頭部 ，當(dāng)足夠接近太陽(yáng)時(shí)一個(gè)拉長(zhǎng)的曲線氣尾從彗發(fā)升起。人們認(rèn)為彗星主要有氨、甲烷、二氧化碳和水構(gòu)成

來(lái)源：
Middle English comete
中古英語(yǔ) comete
from Old English comôta
源自 古英語(yǔ) comôta
from Latin
源自 拉丁語(yǔ)
from Greek (astôr) komôtôs [long-haired (star)]
源自 希臘語(yǔ) (astôr) komôtôs [長(zhǎng)發(fā)的（星）]
from komô [hair]
源自 komô [頭發(fā)]

【引伸】
com.etar.y
<注釋>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.
在大多數(shù)人類歷史期間，人們害怕彗星，甚至在我們自己的時(shí)代彗星的到來(lái)與離去仍受到很大注意。如果我們認(rèn)識(shí)到我們對(duì)它的名字是基于它和人在外形上的相似性，也許彗星看起來(lái)就不太可怕了。比喻的名字首先記錄在亞里士多德的著作中，他使用的kome 是希臘語(yǔ)中意為.頭發(fā).的詞，表示.彗星明亮的尾巴。 然后亞里士多德使用導(dǎo)出的單詞kometes .戴長(zhǎng)發(fā).，作為名詞意義的.comet.。 希臘單詞被采用到拉丁語(yǔ)為cometes， 它再形成晚期拉丁語(yǔ)，給定形式為cometa， 以 cometa 的形式出現(xiàn)于老式英語(yǔ)， 這就是我們單詞comet 的最早英語(yǔ)原形