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infinitesimal
infinitesimal calculus
infinitesimal dose
infinitive
infinitude
infinity
infirm
infirmary
infirmity
infix
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infiltrate

in·fil·trate [ in fíl tràyt, ínfil tràyt ]


transitive and intransitive verb  (past and past participle in·fil·trat·ed, present participle in·fil·trat·ing, 3rd person present singular in·fil·trates)
Definition:
 
1. enter organization to spy on it: to become part of an organization, or enter a place, surreptitiously in order to gather information or influence events, or send agents to do this
Activists were infiltrated into local party organizations.

2. enter enemy territory secretly: to cross into enemy territory without the enemy's knowledge, or send somebody into enemy territory in this way
infiltrate troops behind enemy lines

3. chemistry permeate fluid through substance: to pass through a substance by filtration, or make a liquid or gas pass through a substance by filtration



noun  (plural in·fil·trates)
Definition:
 
medicine fatty accumulation: a substance that gradually accumulates in tissues and cells, e.g. fat


in·fil·tra·tion [ ìnfil tráysh'n ] noun
in·fil·tra·tive [ ínfil tràytiv, in fíltrətiv ] adjective
in·fil·tra·tor [ in fíl tràytər, ínfil tràytər ] noun
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