snail (sn?l)n.1. Any of numerous aquatic or terrestrial gastropod mollusks that typically have a spirally coiled shell, retractile foot, and distinct head.2. A slow-moving, lazy, or sluggish person.[Middle English, from Old English snægl.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.snail (sne?l) n1. (Animals) any of numerous terrestrial or freshwater gastropod molluscs with a spirally coiled shell, esp any of the family Helicidae, such as Helix aspersa (garden snail)2. (Animals) any other gastropod with a spirally coiled shell, such as a whelk3. a slow-moving or lazy person or animal[Old English snægl; related to Old Norse snigill, Old High German snecko] ?snail-?like adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014snail (sne?l) n. 1. any slow-moving gastropod mollusk, having a spirally coiled shell and a ventral muscular foot. 2. a slow or lazy person. [before 900; Middle English; Old English snegel, c. Old Saxon, Old High German snegel, Old Norse snigill] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.Snail Military, a D-shaped formation, 1579.Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.