nom·bril (nŏm'brəl) n.
Heraldry The point on an escutcheon between the fess point and the base point; the midpoint in the lower half of the escutcheon.
[French, from Old French, from (u)n ombril, (a) navel, from Vulgar Latin *umbilīculus, from Latin, diminutive of umbilīcus; see nobh- in Indo-European roots.]