| actinide series |
the series of chemical elements, mostly synthetic and all radioactive, that have from eighty-nine to 103 protons per atom. |
| actinium |
a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac) |
| astatine |
a highly radioactive chemical element of the halogen group that has eighty-five protons in each nucleus. (symbol: At) |
| big brother |
(cap.) in the 1948 novel Nineteen Eighty-Four by George Orwell, an invisible but all-seeing and omnipotent force representing totalitarian government. [1/3 definitions] |
| 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) |
| brachycephalic |
having a short, nearly round head, which is eighty percent or more as wide as it is long. (Cf. dolichocephalic.) |
| constellation |
any of eighty-eight groupings or patterns of stars named after the animals, objects, or mythological characters they are thought to resemble. [1/3 definitions] |
| corn whiskey |
whiskey made from a mash of at least eighty percent corn; corn liquor. |
| D layer |
the lowest layer of the ionosphere, about forty-five to eighty miles above the earth. |
| double time |
a fast military marching pace of one hundred and eighty three-foot steps per minute. [1/3 definitions] |
| eightieth |
indicating rank or position between seventy-ninth and eighty-first. [3 definitions] |
| eighty |
(pl.) the period in one's life from age eighty through age eighty-nine. [2/5 definitions] |
| fourscore |
being three times twenty in number; eighty. |
| francium |
a highly radioactive chemical element of the alkali metal group that has eighty-seven protons in each nucleus. (symbol: Fr) |
| king-size |
of a bed, about seventy-eight by eighty inches. [1/2 definitions] |
| lead2 |
a chemical element that has eighty-two protons in each nucleus and that occurs in pure form as a very dense, malleable bluish gray metal used in many applications requiring high density, such as radiation shielding, shot, and weights. (symbol: Pb) [1/10 definitions] |
| mercury |
a chemical element that has eighty protons in each nucleus and that occurs as a dense silvery liquid at room temperature, used in thermometers, electrical devices, and reflecting surfaces, and as a catalyst; quicksilver. (symbol: Hg). [1/5 definitions] |
| Möbius strip |
a one-sided surface formed by twisting a rectangular strip one hundred and eighty degrees and connecting its two ends together. |
| ninetieth |
indicating rank or position between eighty-ninth and ninety-first. [2/3 definitions] |
| nitrogen |
a chemical element that has seven protons in each nucleus and that occurs as a colorless, odorless gas that comprises about eighty percent of the earth's atmosphere, or in important compounds such as nitrates, proteins, nucleic acids, and ammonia. (symbol: N) [1/3 definitions] |
| octogenarian |
being, of, or pertaining to one that is between eighty and ninety years old. [2 definitions] |