The Collaborative International Dictionary of English v.0.48:

Greaves \Greaves\ (gr[=e]vz), n. pl. [Cf. dial. Sw. grevar
   greaves, LG. greven, G. griebe, also AS. greofa pot. Cf.
   Gravy.]
   The sediment of melted tallow. It is made into cakes for
   dogs' food. In Scotland it is called cracklings. [Written
   also graves.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jambes \Jambes\, Jambeux \Jam"beux\, n. pl. [From F. jambe a
   leg: cf. OF. jambiere. See Jamb, n.] (Ancient Armor)
   In the Middle Ages, armor for the legs below the knees,
   usually having front and back pieces; called also greaves.
   [Written also giambeux.] --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

greaves
    n 1: the residue that remains after animal fat has been rendered
         [syn: greaves, crackling]

Easton's 1897 Bible Dictionary:

Greaves
   only in 1 Sam. 17:6, a piece of defensive armour (q.v.) reaching
   from the foot to the knee; from French greve, "the shin." They
   were the Roman cothurni.