filter

名词 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

动词 filter:

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

1. You need to filter the drinking water.
   你需要把饮用水过滤。
2. The teacher gave each of us a piece of filter paper before doing the experiment.
   做试验前，老师给我们每个人发了一张滤纸。
3. The sunlight filtered through the curtains.
   阳光透过窗帘映了进来。

fil.ter

n.（名词）

A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
用于过滤的材料：可通过液体或气体的多孔性物质，以便从悬浮物质中分离液体
A device containing such a substance.
过滤器：包括这种物质的设备
Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while passing others.
滤光器，滤色镜，滤波器：一种电学的、电子学的、声学的或光学的设备，用于在通过其它物时限制特定频率的信号、振动或放射
v.（动词）
fil.tered,fil.ter.ing,fil.ters
v.tr.（及物动词）
To pass (a liquid or gas) through a filter.
过滤：使（液体或气体）通过过滤器
To remove by passing through a filter:
滤除：用过滤器除去：
例句：
filter out impurities.
滤除杂质

v.intr.（不及物动词）
To pass through or as if through a filter:
过滤，透过：通过或好象通过过滤器：
例句：
Light filtered through the blinds.
光线通过窗帘

To come or go gradually and in small groups:
渗透：逐渐、小批地进入或越过：
例句：
The audience filtered back into the hall.
观众逐渐从后部进入大厅

来源：
Middle English filtre
中古英语 filtre
from Old French
源自 古法语
from Medieval Latin filtrum
源自 中世纪拉丁语 filtrum
[of Germanic origin] * see pel- 5
[源于日耳曼语的] *参见 pel- 5

【引伸】
fil.terer
n.（名词）
fil.terless
adj.（形容词）