名詞 filter:

1. device that removes something from whatever passes through it
2. an electrical device that alters the frequency spectrum of signals passing through it

動(dòng)詞 filter:

1. remove by passing through a filter
   同義詞：filtrate, strain, separate out, filter out
2. pass through
   同義詞：percolate, sink in, permeate
3. run or flow slowly, as in drops or in an unsteady stream
   同義詞：trickle, dribble

1. You need to filter the drinking water.
   你需要把飲用水過濾。
2. The teacher gave each of us a piece of filter paper before doing the experiment.
   做試驗(yàn)前，老師給我們每個(gè)人發(fā)了一張濾紙。
3. The sunlight filtered through the curtains.
   陽光透過窗簾映了進(jìn)來。

fil.ter

n.（名詞）

A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
用于過濾的材料：可通過液體或氣體的多孔性物質(zhì)，以便從懸浮物質(zhì)中分離液體
A device containing such a substance.
過濾器：包括這種物質(zhì)的設(shè)備
Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while passing others.
濾光器，濾色鏡，濾波器：一種電學(xué)的、電子學(xué)的、聲學(xué)的或光學(xué)的設(shè)備，用于在通過其它物時(shí)限制特定頻率的信號(hào)、振動(dòng)或放射
v.（動(dòng)詞）
fil.tered,fil.ter.ing,fil.ters
v.tr.（及物動(dòng)詞）
To pass (a liquid or gas) through a filter.
過濾：使（液體或氣體）通過過濾器
To remove by passing through a filter:
濾除：用過濾器除去：
例句：
filter out impurities.
濾除雜質(zhì)

v.intr.（不及物動(dòng)詞）
To pass through or as if through a filter:
過濾，透過：通過或好象通過過濾器：
例句：
Light filtered through the blinds.
光線通過窗簾

To come or go gradually and in small groups:
滲透：逐漸、小批地進(jìn)入或越過：
例句：
The audience filtered back into the hall.
觀眾逐漸從后部進(jìn)入大廳

來源：
Middle English filtre
中古英語 filtre
from Old French
源自 古法語
from Medieval Latin filtrum
源自 中世紀(jì)拉丁語 filtrum
[of Germanic origin] * see pel- 5
[源于日耳曼語的] *參見 pel- 5

【引伸】
fil.terer
n.（名詞）
fil.terless
adj.（形容詞）