|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|1.||the second letter in the Greek alphabet (Β, β), a consonant, transliterated as b|
|2.||the second highest grade or mark, as in an examination|
|a. involving or relating to electrons: beta emitter|
|b. relating to one of two or more allotropes or crystal structures of a solid: beta iron|
|c. relating to one of two or more isomeric forms of a chemical compound|
|[from Greek bēta, from Hebrew; see |
beta be·ta (bā'tə, bē'-)
Symbol β The second letter of the Greek alphabet.
The second item in a series or system of classification.
A beta particle.
A beta ray.
Of or relating to the second position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
Of or relating to an isomeric variation of a chemical compound, such as a stereoisomer.
beta/bay't*/, /be't*/ or (Commonwealth) /bee't*/ n.