from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Articulated with relatively low pressure of the airstream below the glottis, as English (b) and (d) compared with (p) and (t).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. weakly articulated (of a consonant), hence voiced; especially as compared to the others of a group of homorganic consonants.
Latin lēnis, soft; see lē- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin lenis ("soft, smooth"). (Wiktionary)