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Webster 1913 Edition

Adj.

[L.

tumulus

a mound: cf. F.

tumulaire

. See

Consisting in a heap; formed or being in a heap or hillock.

Pinkerton.

Adj.

[L. tumulus, a heap.] Consisting in a heap; formed or being in a heap or hillock.

tumular ‎(not comparable)

Consisting of a heap; formed or being in a heap or hillock.
(Can we find and add a quotation of Pinkerton to this entry?)