Merriam-Webster's Collegiate® Dictionary, 11th Edition
SALLOW
I. noun
Etymology: Middle English, from Old English sealh; akin to Old High German salha sallow, Latin salix willow Date: before 12th century any of several Old World broad-leaved willows (as Salix caprea ) including important sources of charcoal and tanbark,
II. adjective
Etymology: Middle English salowe, from Old English salu; akin to Old High German salo murky, Russian solovyĭ yellowish gray Date: before 12th century of a grayish greenish yellow color, sallowish adjective sallowness noun