1) Disaccharide 2) Tetrasaccharide 3) Trisaccharide 
Compare with monsaccharide and polysaccharide. A carbohydrate that consists of only a few linked monosaccharide units.
An oligosaccharide (from the Greek oligos, a few, and sacchar, sugar) is a saccharide polymer containing a small number (typically three to nine) of simple sugars (monosaccharides). Oligosaccharides can have many functions; for example, they are commonly found on the plasma membrane of animal cells where they can play a role in cell–cell recogni...
any carbohydrate of from three to six units of simple sugars (monosaccharides). A large number of oligosaccharides have been prepared by partially ... [5 related articles]
<chemistry> A saccharide of a small number of component sugars, either O or N linked to the next sugar. Number of component sugars not rigorously defined. ... (18 Nov 1997) ... 
(ol″ĭ-go-sak´ә-rīd) a carbohydrate that on hydrolysis yields a small number of monosaccharides; see also polysaccharide.
A compound consisting of relatively few (2-10) mono-saccharide units, which, upon complete acid hydrolysis, yields only simple sugars.A saccharide of a small number of component sugars, either O- or N-linked to the next sugar. Number of component sugars not rigorously defined.
Type: Term Pronunciation: ol′i-gō-sak′ă-rīd Definitions: 1. A compound made up of the condensation of a small number of monosaccharide units.
[n] - any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis
oligosaccharide A compound made up of the condensation of a small number of monosaccharide units (a simple sugar such as glucose or fructose that cannot be broken down into simpler sugars).
A carbohydrate that is composed of a small number (3 to 10) of simple sugar units linked together.
noun any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis
Carbohydrate comprising a few monosaccharide units linked together. It is a general term used to indicate that a carbohydrate is larger than a simple di- or trisaccharide but not as large as a polysaccharide