| atom |
an invisible component of any element, consisting of protons, neutrons, and electrons, once considered the smallest possible unit of matter. [1/2 definitions] |
| atomic number |
the number of protons or positive electrical charges in the nucleus of one atom of a given element. [2 definitions] |
| atomic weight |
the average weight of one atom of a given element, expressed in atomic mass units. |
| at. wt. |
abbreviation of "atomic weight," the average weight of one atom of a given element, expressed in atomic mass units. |
| Au |
symbol of the chemical element gold. |
| augmentative |
in grammar, of or pertaining to a word, word element, or phrase that signifies an increase in size, intensity, or the like, such as "super-" in "superheated". [2/3 definitions] |
| B |
symbol of the chemical element boron. |
| Ba |
symbol of the chemical element barium. |
| barium |
a chemical element of the alkaline-earth group that has fifty-seven protons in each nucleus and that is usu. found in compounds such as salts. (symbol: Ba) [1/2 definitions] |
| Be |
symbol of the chemical element beryllium. |
| beast |
the uncivilized or animal element within humans. [1/3 definitions] |
| berkelium |
a radioactive synthetic metal element of the actinide series that has ninety-seven protons in each nucleus. (symbol: Bk) |
| beryllium |
a chemical element of the alkaline-earth group that has four protons in each nucleus and occurs in pure form as a hard, light, gray solid, chiefly used in alloys with copper and in aerospace material. (symbol: Be) |
| Bi |
symbol of the chemical element bismuth. |
| bichloride |
a chemical compound in which there are two atoms of chlorine for each atom of another element or group; dichloride. |
| bismuth |
a chemical element that has eighty-three protons in each nucleus and is a white brittle crystalline metal with very low thermal and electrical conductivity, used chiefly in alloys and medicines. (symbol: Bi) |
| Bk |
symbol of the chemical element berkelium. |
| boron |
a chemical element that has five protons in each nucleus and that occurs naturally only in compounds such as boric acid and borax. (symbol: B) |
| Br |
symbol of the chemical element bromine. |
| bromide |
a compound consisting of bromine and at least one other element. [1/4 definitions] |
| bromine |
a chemical element of the halogen group that has thirty-five protons in each nucleus, occurring as a toxic, volatile, dark reddish brown liquid or in various compounds such as acids and salts. (symbol: Br) |