Webster's Revised Unabridged Dictionary · 1913

Sallow

Sallow (sal"lo) , noun

[Old English salwe, Anglo-Saxon sealh; akin to Old High German salaha, German salweide, Icelandic selja, Latin salix, Ir. sail, saileach, Gael. seileach, Welsh helyg, Greek "eli`kh.]

1.
The willow; willow twigs. [Poetic] — Tennyson
And bend the pliant sallow to a shield. — Fawkes
The sallow knows the basketmaker's thumb. — Emerson
2.
(Botany) A name given to certain species of willow, especially those which do not have flexible shoots, as Salix caprea, Salix cinerea, etc.
Collocations (1)
Sallow thorn (Botany) , a European thorny shrub (Hippophae rhamnoides) much like an Elaeagnus. The yellow berries are sometimes used for making jelly, and the plant affords a yellow dye.

Sallow , adjective

[Anglo-Saxon salu; akin to Dutch zaluw, Old High German salo, Icelandic solr yellow.]

Having a yellowish color; of a pale, sickly color, tinged with yellow; as, a sallow skin. — Shakespeare

Sallow , transitive verb

To tinge with sallowness. [Poetic]
July breathes hot, sallows the crispy fields. — Lowell