1. To plow, harrow, and break up, as land, without seeding, for the purpose of destroying weeds and insects, and rendering it mellow; as, it is profitable to fallow cold, strong, clayey land.
2. Pale red or pale yellow; as, a fallow deer or greyhound.
3. (Science: zoology) fallow chat, fallow finch, a small European bird, the wheatear (Saxicola aenanthe).
Origin: as. Fealu, fealo, pale yellow or red; akin to D. Vaal fallow, faded, OHG. Falo, g. Falb, fahl, Icel. Folr, and prob. To lith. Palvas, OSlav. Plav white, L. Pallidus pale, pallere to be pale, gr. Gray, Skr. Palita. Cf. Pale, Favel, favor.