The Collaborative International Dictionary
Engrailing
Engrail \En*grail"\, v. t. [imp. & p. p. Engrailed; p. pr. & vb. n. Engrailing.] [F. engr[^e]ler; pref. en- (L. in) + gr[^e]le hail. See Grail gravel.]
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To variegate or spot, as with hail.
A caldron new engrailed with twenty hues.
--Chapman. (Her.) To indent with small curves. See Engrailed.
Wiktionary
engrailing
vb. (present participle of engrail English)