| NOUN | quantity | A, angstrom, angstrom unit | a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron) |
|---|---|---|---|
| substance | A, vitamin A, antiophthalmic factor, axerophthol | any of several fat-soluble vitamins essential for normal vision | |
| substance | A, deoxyadenosine monophosphate | one of the four nucleotides used in building DNA | |
| substance | A, adenine | (biochemistry) purine base found in DNA and RNA | |
| quantity | A, ampere, amp | the basic unit of electric current adopted under the Systeme International d'Unites | |
| communication | A / a | the 1st letter of the Roman alphabet | |
| body | A, type A, group A | the blood group whose red cells carry the A antigen |
| Sounds | ah; ey' | |
|---|---|---|
| Meaning | A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation. | |
|---|---|---|
| Synonyms | angstrom, angstrom unit | |
| Part of | nanometer, nanometre, nm, millimicron, micromillimeter, micromillimetre | A metric unit of length equal to one billionth of a meter |
| Parts | picometer, picometre, micromicron | A metric unit of length equal to one trillionth of a meter |
| Broader | metric linear unit | A linear unit of distance in metric terms |
| Spanish | A, angstromio, angstrom, ángstrom | |
| Catalan | A, àngstrom | |
| Meaning | Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes. | |
|---|---|---|
| Synonyms | vitamin A, antiophthalmic factor, axerophthol | |
| Narrower | vitamin A1, retinol | An unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene |
| vitamin A2, dehydroretinol | A viscous alcohol that is less active in mammals than is vitamin A1 | |
| Broader | fat-soluble vitamin | Any vitamin that is soluble in fats |
| Spanish | retinol, vitamina A | |
| Catalan | vitamina A | |
| Meaning | One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose). | |
|---|---|---|
| Synonym | deoxyadenosine monophosphate | |
| Broader | nucleotide, base | A phosphoric ester of a nucleoside |
| Spanish | monofosfato desoxiadenosina | |
| Catalan | monofosfat de desoxiadenosina | |
| Meaning | (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA. | |
|---|---|---|
| Synonym | adenine | |
| Category | biochemistry | The organic chemistry of compounds and processes occurring in organisms |
| Broader | purine | Any of several bases that are derivatives of purine |
| Substance of | deoxyribonucleic acid, desoxyribonucleic acid, DNA | (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix |
| ribonucleic acid, RNA | (biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes | |
| Spanish | adenina | |
| Catalan | adenina | |
| Meaning | The basic unit of electric current adopted under the Systeme International d'Unites. | |
|---|---|---|
| Synonyms | ampere, amp | |
| Part of | abampere, abamp | A unit of current equal to 10 amperes |
| Parts | milliampere, mA | One thousandth of an ampere |
| Broader | current unit | A measure of the amount of electric charge flowing past a circuit point at a specific time |
| Spanish | ampere, amperio | |
| Catalan | ampere, amper | |
| Meaning | The 1st letter of the Roman alphabet. | |
|---|---|---|
| Member of | Roman alphabet, Latin alphabet | The alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe |
| Broader | letter, letter of the alphabet, alphabetic character | The conventional characters of the alphabet used to represent speech |
| Spanish | a, A | |
| Catalan | a | |
| Meaning | The blood group whose red cells carry the A antigen. | |
|---|---|---|
| Synonyms | type A, group A | |
| Broader | blood group, blood type | Human blood cells (usually just the red blood cells) that have the same antigens |
| Spanish | A, grupo A, tipo A | |
| Catalan | A, grup A, tipus A | |
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