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| Mar. |
abbreviation of "March," the third month of the Gregorian calendar year, having thirty-one days. |
| March |
the third month of the Gregorian calendar year, having thirty-one days. |
| May |
the fifth month of the Gregorian calendar year, having thirty-one days. [1/2 definitions] |
| My. |
abbreviation of "May," the fifth month of the Gregorian calendar year, having thirty-one days. |
| niobium |
a chemical element that has forty-one protons in each nucleus and that occurs in pure form as a dense, soft, shiny bluish white solid metal, used esp. in alloys of steel to add strength; columbium. (symbol: Nb) |
| Oct. |
abbreviation of "October," the tenth month of the Gregorian calendar year, having thirty-one days. |
| October |
the tenth month of the Gregorian calendar year, having thirty-one days. |
| promethium |
a synthetic radioactive chemical element of the rare-earth metallic group that has sixty-one protons in each nucleus. (symbol: Pm) |
| protactinium |
a very toxic radioactive chemical element of the actinide series that has ninety-one protons in each nucleus and that is a product of the radioactive decay of uranium. (symbol: Pa) |
| rare-earth metal |
any of the series of chemical elements, all metals, that have from fifty-seven to seventy-one protons per atom; lanthanide series. |
| ROM |
abbreviation of "read-only memory." |
| scandium |
a metallic chemical element that has twenty-one protons in each nucleus and that forms a trivalent ion present in trace quantities in many minerals. (symbol: Sc) |
| stratopause |
the zone between the mesosphere and stratosphere wherein temperatures drop as altitude increases, about thirty-one to thirty-five miles above the earth. |
| super |
in theater, a walk-on player; extra. [1/6 definitions] |
| tanka |
an unrhymed Japanese poem of thirty-one syllables in five lines, having five syllables in the first and third lines and seven in each of the other three lines. |
| thallium |
a chemical element that has eighty-one protons in each nucleus and that can be isolated as a soft easily corroding toxic metal whose sulfate salt is sometimes used as a pesticide. (symbol: Tl) |
| universal suffrage |
the right of all a nation's citizens above a certain age, usu. eighteen or twenty-one, to vote, unless they are in violation of certain basic legal requirements. |
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