An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A suffix meaning "drawn, written," specialized in meaning to indicate the instrument rather than the written product of the instrument.

A suffix, from Gk. -graphos "(something) drawn or written, one who draws or writes," from graphein "to draw, write."

A suffix from the stem of negârdan, negâštan "to paint, write," → graph.

An adjective relating to → -graph.

→ -graph + → -ic.

A combining form denoting a process or form of drawing, writing, representing, recording, describing, etc., or an art or science concerned with such a process. Examples: geography; orthography; → photography; → radiography; → selenography; → tomography.

→ graph.

The study of the surface features of Mars; the geography of Mars.

Areography, from Gk. Ares "Mars" + → -graphy.

Bahrâm-negâri, from Bahrâm "Mars" + -negâri→ -graphy.

A photographic instrument with great light gathering power which is used to photograph a large field in a single exposure.

Astrograph, from → astro- + → graph.

Axtarnegâr, from axtar, → astro-, + -negâr, → -graph.

The photography of stars, other celestial bodies, and stellar fields.

→ astro-, → photography.

A very accurate instrument that measures, indicates, or graphically records time intervals such as the duration of an event.

Chronograph, from Gk. khronos "time" + → -graph.

Gâhnegâr, from gâh "time" + negâr, → -graph.

In → graph theory, a simple graph with an → edge between every pair of → vertices.

→ complete; → graph.

In → =graph theory, a graph if for every pair of distinct vertices there is a path.

→ connected; → graph.

An instrument which, when used in a telescope, produces an artificial eclipse, permitting the study of the → solar corona without a total eclipse of the Sun. It was invented in 1930 by the French astronomer Bernard Lyot (1897-1952).

From → corona + → -graph.

Of, or relating to → coronagraphy.

→ coronagraphy; → -ic..

A technique used to observe a relatively dim object (like an → exoplanet) lying close to an outshining bright source (such as star). This is done by blocking the bright object, in the same way the → solar corona is observed using a → coronagraph.

→ coronagraph + suffix -y.

The branch of → cosmology concerned with the dimensional structures of the → Universe and their measurement.

→ cosmo-; → -graphy.

A spectrograph that utilizes cross dispersion.

→ cross; → dispersion; → spectrograph.

The science of forms, properties, and structure of crystals.

→ crystal; → -graphy; → -logy.

In → graph theory, a graph with → directed edges. Also calle → digraph.

→ directed; → graph.

A technique using a series of Doppler-shifted line profiles at different orbital phases in cataclysmic variable stars (CVs) to image the compact system in the light of a particular emission line. Although developed for CVs, the method has wider applications. An alternative method is → eclipse mapping.

→ Doppler effect; → tomography.

A spectrograph that uses an echelle grating to disperse the light.

→ echelle grating; → spectrograph.

In → graph theory, a graph with any number of → vertices which do not have → edges.

→ empty; → graph.

Of or pertaining to → geography.

→ geography; → -ic.