a rich, friable soil containing a relatively equal mixture of sand and silt and a somewhat smaller proportion of clay.
a mixture of clay, sand, straw, etc., used in making molds for founding and in plastering walls, stopping holes, etc.
earth or soil.
Obsolete. clay or clayey earth.
verb (used with object)
to cover or stop with loam.

before 900; late Middle English lome, earlier lam(e), Old English lām; cognate with Dutch leem, German Lehm loam, clay; akin to lime1

loaminess, noun
loamless, adjective
loamy, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
loam (ləʊm)
1.  rich soil consisting of a mixture of sand, clay, and decaying organic material
2.  a paste of clay and sand used for making moulds in a foundry, plastering walls, etc
3.  (tr) to cover, treat, or fill with loam
[Old English lām; related to Old Swedish lēmo clay, Old High German leimo]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. lam "clay, mud, mire, earth," from P.Gmc. *laimaz (cf. O.S. lemo, Du. leem, Ger. Lehm), from PIE root *lai-/*li- "to be sticky" (see lime (1)). As a type of highly fertile clayey soil, it is attested from 1664.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
loam   (lōm)  Pronunciation Key 
Soil composed of approximately equal quantities of sand, silt, and clay, often with variable amounts of decayed plant matter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These prime soils are ideal for growing crops because of their loamy texture,
  which permits good drainage.
She was still in the spell of loamy possibilities then.
During the day, they crawl across the loamy ground, digging with their bare
Surface soils of fine sandy loam over loamy non-calcareous subsoils.
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