runt

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An undersized animal, especially the smallest animal of a litter.
• noun Derogatory A short person.

from The Century Dictionary.

• noun A young ox or cow; a steer or heifer; also, a stunted ox or cow, or other under-sized animal; one below the usual size and strength of its kind; especially, the smallest or weakest one of a litter of pigs or puppies. Compare def. 4.
• noun Hence A short, stockish person; a dwarf.
• noun A rude, ill-bred person; a boor or hoiden.
• noun A breed of domestic pigeons. A single bird may weigh as much as 2 1/2 pounds.
• noun A stump of underwood; also, the dead stump of a tree.
• noun The stalk or stem of a plant.
• noun The rump.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) Any animal which is unusually small, as compared with others of its kind; -- applied particularly to domestic animals.
• noun (Zoöl.) A variety of domestic pigeon, related to the barb and carrier.
• noun A dwarf; also, a mean, despicable, boorish person; -- used opprobriously.
• noun Obs. or Prov. Eng. The dead stump of a tree; also, the stem of a plant.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The smallest animal of a litter.
• noun Undersized or stunted plant, animal or person.
• noun computing An Ethernet packet that does not meet the medium's minimum packet size of 64 bytes.
• noun typography A single word (or portion of a hyphenated word) that appears as the last line of a paragraph.
• noun A breed of pigeon related to the carrier pigeon.
• noun obsolete, UK, dialect A hardened stem or stalk of a plant.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun disparaging terms for small people