Dictionary![]() ![]() tu•mu•lusPronunciation: (tOO'myu-lus, tyOO'-), [key] —n., —pl. -lus•es, -liPronunciation: (-lī"). [key] 1. Archaeol.an artificial mound, esp. over a grave; barrow. 2. Geol.a domelike swelling or mound formed in congealed lava. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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