There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.
MOLECULE
atom, molecule, particle, corpuscle, mote, speck
(noun) (nontechnical usage) a tiny piece of anything
molecule
(noun) (physics and chemistry) the simplest structural unit of an element or compound
Source: WordNet® 3.1
Etymology
Noun
molecule (plural molecules or moleculæ)
(chemistry) The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
A tiny amount.
Synonyms
• See also molecule
• (small amount): see also modicum.
Hyponyms
• macromolecule
Meronyms
• atom
Source: Wiktionary
Mol"e*cule, n. Etym: [Dim. fr. L. moles a mass: cf. F. molécule. See 3d Mole.]
1. One of the very small invisible particles of which all matter is supposed to consist.
2. (Physics)
Definition: The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state.
3. (Chem.)
Definition: A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom.
Source: Webster’s Unabridged Dictionary 1913 Edition
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