artificial horizon noun

A gyroscopic device indicating an aircraft's attitude in relation to the horizontal

artificial insemination noun

The injection of semen into the uterus or vagina by other means than sexual union (abbrev AI)

artificial intelligence noun

The use of computers in such a way that they perform functions normally associated with human intelligence, such as learning, adapting, self-correction and decision-taking (abbrev AI)

artificial kidney noun

A kidney machine

artificial language noun

An invented language functioning not as the native speech of its users but as a computer language or means of international communication

artificial life noun

Simulation of the behaviour of living organisms by computers

artificial porcelain noun

Soft-paste porcelain

artificial radioactivity noun

Radiation from isotopes after high-energy bombardment in an accelerator by alpha particles, protons, or neutrons

artificial respiration noun

Stimulation of respiration manually or mechanically by forcing air in and out of the lungs

artifical satellite noun

A man-made spacecraft designed to orbit a celestial body

artificial selection see select

artificial silk see silk

artificial sunlight noun

Light from lamps rich in ultraviolet rays

artificial insemination by donor

Former name for donor insemination (see under donation), discontinued because of the similarity of its commonly used abbreviation AID to AIDS

horizon /hə-rīˈzən/

1. The line at which earth and sky seem to meet (called the sensible horizon, apparent horizon or visible horizon)
2. A plane through the earth's centre parallel to the sensible horizon (called the rational horizon), or the great circle in which it meets the heavens (celestial horizon; astronomy)
3. A horizontal reflecting surface, eg of mercury, used as a substitute for the horizon in taking an observation (an artificial horizon)
4. A stratigraphical level, characterized generally by some particular fossil or fossils (geology), by a different physical property of the soil (soil science), or by artefacts characteristic of a particular culture or period (archaeology)
5. A level line or surface (anatomy)
6. (often pl) the limit of one's experience or mental vision

horizontal /hor-i-zontˈl/ adjective

1. Relating to the horizon
2. Parallel to the horizon
3. Level
4. Near the horizon
5. Measured in the plane of the horizon
6. Applying equally to all members of a group, aspects of an activity, etc
7. Of relationships between separate groups of equal status or stage of development
8. Denoting a balance sheet in which assets are set out in one column, and equity and liabilities in another, side by side (accounting)

1. A horizontal line, position or object
2. (also horizontal scrub) a large Tasmanian shrub, whose stem and branches ascend and then grow horizontally to form a dense mass of boughs and foliage

horizontalˈity noun

horizonˈtally adverb

horizontal bar noun (gymnastics)

A steel bar used for swinging and vaulting exercises