| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
|---|
| acting | (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
|---|
| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
|---|
| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
|---|
| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
|---|
| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
|---|
| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
|---|
| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
|---|
| actinoid | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
|---|
| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
|---|
| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
|---|
| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
|---|
| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
|---|
| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
|---|
| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
|---|
| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
|---|
| actinomyxidian | (noun) of or relating to parasites of worms | - |
|---|
| actinon | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinoid |
|---|
| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
|---|
| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
|---|
| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
|---|
| action | (noun) the most important or interesting work or activity in a specific area or field | - |
|---|
| (noun) a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong | Synonyms: action at law, legal action |
| (noun) something done (usually as opposed to something said) | - |
| (noun) a military engagement | Synonyms: military action |
| (noun) an act by a government body or supranational organization | - |
| (noun) the operating part that transmits power to a mechanism | Synonyms: action mechanism |
| (noun) In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges). | - |
| (noun) the trait of being active and energetic and forceful | - |
| (noun) the series of events that form a plot | - |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: activity, natural action, natural process |
| (noun) the state of being active | Synonyms: activeness, activity |
| activating | (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
|---|
| activation | (noun) the activity of causing to have energy and be active | Synonyms: activating, energizing |
|---|
| (noun) making active and effective (as a bomb) | - |
| (noun) stimulation of activity in an organism or chemical | - |
| activator | (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription | - |
|---|
| active | (noun) a person who is a participating member of an organization | - |
|---|
| (noun) the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb | Synonyms: active voice |
| (noun) chemical agent capable of activity | Synonyms: active agent |
| activeness | (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activity |
|---|
| (noun) the state of being active | Synonyms: action, activity |
| activewear | (noun) attire worn for sport or for casual wear | Synonyms: athletic wear, sportswear |
|---|
| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
|---|
| activist | (noun) a militant reformer | Synonyms: militant |
|---|
| activity | (noun) any specific behavior | - |
|---|
| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |