| I | | |
| n. (substance) | 1. atomic number 53, i, iodin, iodine | a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks). |
| ~ chemical element, element | any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| ~ iodine-131 | heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter. |
| ~ iodine-125 | light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism. |
| ~ halogen | any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions. |
| ~ brine, saltwater, seawater | water containing salts.; "the water in the ocean is all saltwater" |
| n. (quantity) | 2. 1, ace, i, one, single, unity | the smallest whole number or a numeral representing this number.; "he has the one but will need a two and three to go with it"; "they had lunch at one" |
| ~ digit, figure | one of the elements that collectively form a system of numeration.; "0 and 1 are digits" |
| ~ monas, monad | a singular metaphysical entity from which material properties are said to derive. |
| ~ singleton | a single object (as distinguished from a pair). |
| n. (communication) | 3. i | the 9th letter of the Roman alphabet. |
| ~ latin alphabet, roman alphabet | the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe. |
| ~ alphabetic character, letter of the alphabet, letter | the conventional characters of the alphabet used to represent speech.; "his grandmother taught him his letters" |
| adj. | 4. 1, ane, i, one | used of a single unit or thing; not two or more.; "`ane' is Scottish" |
| ~ cardinal | being or denoting a numerical quantity but not order.; "cardinal numbers" |
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