| active air defense | air defense by the use aircraft or missiles or artillery or electronic countermeasures |
| active matrix screen | a type of LCD screen used for some portable computers, there is a separate circuit for each pixel |
| active placebo | a placebo used in experimental tests of a drug that has noticeable side effects, an active placebo mimics the side effects of the experimental drug |
component
constituent
element | an artifact that is one of the individual parts of which a composite entity is made up, especially a part that can be separated from or attached to a system, spare components for cars, a component or constituent element of a system |
detector
sensor
sensing element | any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner |
drug cocktail
highly active antiretroviral therapy
HAART | a combination of protease inhibitors taken with reverse transcriptase inhibitors, used in treating AIDS and HIV |
| heating element | the component of a heater or range that transforms fuel or electricity into heat |
| logic element | an electronic device that performs an elementary logic operation |
pixel
pel
picture element | (computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot), the greater the number of pixels per inch the greater the resolution |
threshold element
threshold gate | a logic element that performs a threshold operation |
| plot element | a component or element of the plot of a story |
component
constituent
element
factor
ingredient | an abstract part of something, jealousy was a component of his character, two constituents of a musical composition are melody and harmony, the grammatical elements of a sentence, a key factor in her success, humor: an effective ingredient of a speech |
| active application | an application that is currently running and in the foreground |
| element | the most favorable environment for a plant or animal, water is the element of fishes |
| active site | the part of an enzyme or antibody where the chemical reaction occurs |
| active | a person who is a participating member of an organization, the club issues a list of members, both the actives and the retirees |
| active citizen | a citizen who takes an active role in the community (as in crime prevention and neighborhood watch) |
| active trust | a trust in which the trustee must perform certain duties |
| active birth | childbirth during which the mother is encouraged to be an active participant |
| active transport | transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient, requires an expenditure of energy |
identity identity element
identity operator | an operator that leaves unchanged the element on which it operates, the identity under numerical multiplication is |
active voice
active | the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb, `The boy threw the ball' uses the active voice |
| element | a straight line that generates a cylinder or cone |
| element of a cone | a straight line joining the apex and a point on the base |
| element of a cylinder | a straight line running the length of the cylinder |
| element | the situation in which you are happiest and most effective, in your element |
| active immunity | a form of acquired immunity in which the body produces its own antibodies against diseaseausing antigens |
chemical element
element | any of the more than known substances (of which occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| transuranic element | any element having an atomic number greater than (which is the atomic number of uranium), all are radioactive |
rare earth
rare-earth element
lanthanoid
lanthanide
lanthanon | any element of the lanthanide series (atomic numbers through ) |
metallic element
metal | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
bohrium
Bh
element
atomic number | a transuranic element |
darmstadtium
Ds
element
atomic number | a radioactive transuranic element |
dubnium
Db
hahnium
element
atomic number | a transuranic element |
hassium
Hs
element
atomic number | a radioactive transuranic element |
meitnerium
Mt
element
atomic number | a radioactive transuranic element |
roentgenium
Rg
element
atomic number | a radioactive transuranic element |
rutherfordium
Rf
unnilquadium
Unq
element
atomic number | a radioactive transuranic element which has been synthesized |
seaborgium
Sg
element
atomic number | a transuranic element |
ununbium
Uub
element
atomic number | a radioactive transuranic element |
ununhexium
Uuh
element
atomic number | a radioactive transuranic element |
ununpentium
Uup
element
atomic number | a radioactive transuranic element |
ununquadium
Uuq
element
atomic number | a radioactive transuranic element |
ununtrium
Uut
element
atomic number | a radioactive transuranic element |
active agent
active | chemical agent capable of activity |
| element | one of four substances thought in ancient and medieval cosmology to constitute the physical universe, the alchemists believed that there were four elements |
| trace element | an element that occurs at very small quantities in the body but is nonetheless important for many biological processes |
wetting agent
wetter
surfactant
surface-active agent | a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved |
be active
move | be in a state of action, she is always moving |
| active | characterized by energetic activity, an active toddler, active as a gazelle, an active man is a man of action |