from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To make slender, fine, or small: The drought attenuated the river to a narrow channel.
- transitive v. To reduce in force, value, amount, or degree; weaken: Medicine attenuated the fever's effect.
- transitive v. To lessen the density of; rarefy.
- transitive v. Biology To make (bacteria or viruses) less virulent.
- transitive v. Electronics To reduce (the amplitude of an electrical signal) with little or no distortion.
- intransitive v. To become thin, weak, or fine.
- adj. Reduced or weakened, as in strength, value, or virulence.
- adj. Botany Gradually tapering to a slender point.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To reduce in size, force, value, amount, or degree.
- v. To make thinner, as by physically reshaping, starving, or decaying.
- v. To weaken.
- v. To rarefy.
- v. To reduce the virulence of a bacteria or virus.
- v. To reduce the amplitude of an electrical signal.
- adj. Gradually tapering into a petiole-like extension toward the base.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make thin or slender, as by mechanical or chemical action upon inanimate objects, or by the effects of starvation, disease, etc., upon living bodies.
- transitive v. To make thin or less consistent; to render less viscid or dense; to rarefy. Specifically: To subtilize, as the humors of the body, or to break them into finer parts.
- transitive v. To lessen the amount, force, or value of; to make less complex; to weaken.
- intransitive v. To become thin, slender, or fine; to grow less; to lessen.
- adj. Made thin or slender.
- adj. Made thin or less viscid; rarefied.
from The Century Dictionary and Cyclopedia
- To make thin or slender; reduce in thickness; wear or draw down: as, an attenuated thread or wire.
- To reduce by comminution or attrition; make small or fine: as, extremely attenuated particles of dust or flour.
- To make thin or rare; reduce in density; increase the fluidity or rarity of.
- To lessen in complexity or intensity; reduce in strength or energy; simplify; weaken: as, the attenuated remedies of the homeopathists.
- Figuratively, to weaken or reduce in force, effect, or value; render meager or jejune; fine down.
- To lessen; diminish: said of number. Howell.
- To become thin, slender, or fine; diminish; lessen.
- In brewing and distilling, to undergo the process of attenuation. See attenuation, 4.
- Slender; thin.
- In botany, tapering gradually to a narrow extremity.
- Of thin consistency; dilute; rarefied.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. weaken the consistency of (a chemical substance)
- adj. reduced in strength
- v. become weaker, in strength, value, or magnitude
Latin attenuāre, attenuāt- : ad-, ad- + tenuāre, to make thin (from tenuis, thin; see ten- in Indo-European roots).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin attenuāre, from attenuāt-, at- = ad-, ad- ("to") + tenuāre ("to make thin"), tenuis ("thin"). (Wiktionary)