WoD - attenuate

at·ten·u·ate   /v. əˈtɛnyuˌeɪt; adj. əˈtɛnyuɪt, -ˌeɪt/ Show Spelled [v. uh-ten-yoo-eyt; adj. uh-ten-yoo-it, -eyt]

–verb (used with object)
1. to weaken or reduce in force, intensity, effect, quantity, or value: to attenuate desire.
2. to make thin; make slender or fine.
3. Bacteriology, Immunology . to render less virulent, as a strain of pathogenic virus or bacterium.
4. Electronics . to decrease the amplitude of (an electronic signal).
–verb (used without object)
5. to become thin or fine; lessen.
–adjective
6. weakened; diminishing.
7. Botany . tapering gradually to a narrow extremity.

Origin:
1520–30; < L attenuātus (ptp. of attenuāre to thin, reduce).