lump
noun
a piece or mass of solid matter without regular shape or of no particular shape.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The feathery vanes stirred not, and the canvass flapped against the mast, as the old girl rolled lumpingly in the swell.
From Blackwood's Edinburgh Magazine, Volume 61, No. 380, June, 1847 by Various