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

An organic compound which contains benzene rings in its structure. The simplest is therefore benzene (C₆H₆). Aromatic compounds have a planar ring of atoms linked by alternate single and double bounds.

→ aromatic; → compound.

A substance whose molecules are made up of atoms of at least two different elements.

→ chemical; → compound.

1a) General: Consisting of two or more separate substances, ingredients, elements, or parts. A compound usually constitutes a new and independent entity with regard to its components. → composite, → combination.
1b) Chemistry: A substance whose molecules are made up of at least two different elements.
1c) Linguistics: A word consisting of two or more independent elements such as sunflower, eyeball, football.
2a) To combine so as to form a whole; mix.
2b) To produce or create by combining two or more ingredients or parts; compose or make up.

M.E. compouned, p.p. of compounen, M.Fr. compon-, stem of compondre, from L. componere, → compose.

Hamnât, literally "placed together," from ham- "together," → com-, + nât "placed, put," variant of nâd, nâde, from Lori nâdan "to place, put" (Tabari da-nâyan "to place, put"), variant of nehâdan "to place, put," → compose.

An angle that results from the combination of two other angles. These angles are expressed by → compound angle formulae.

→ compound; → angle.

One of eight equations that give the → trigonometric functions of → compound angles.
sin(A± B) = sinA.cosnd angleB± cosA.sinB
cos(A + B) = cosA.cosB - sinA.sinB
cos(A - B) = cosA.cosB + sinA.sinB
tan(A + B) = (tanA + tanB)/(1 - tanA.tanB)
tan(A - B) = (tanA - tanB)/(1 + tanA.tanB).

→ compound; → angle; → formula.

A curve that is made up of a series of successive tangent circular arcs.

→ compound; → curve.

In statistics, an event whose probability of occurrence depends upon the probability of occurrence of two or more independent events.

→ compound; → event.

Same as → complex fraction.

→ compound; → fraction.

A lens system consisting of two or more lenses with the same radius used together in order to remove aberrations found in a single lens.

→ compound; → lens.

A temporary excited state of the atomic nucleus which results from the collision of an incident energetic particle with a target nucleus. Subsequently the nucleus decays by emitting particle(s).

→ compound; → nucleus.

A quantity expressed as the sum of two or more quantities of differing units. For example 5 hours and 15 minutes or 4 meters and 20 centimeters. → composite number.

→ compound; → number.

A statement formed from simple statements by the use of words such as "and," "or," "not," "implies," or their corresponding symbols.

→ compound; → proposition.

A verb that is made up of several words, such as tear up, take away, double-click.

→ compound; → verb.

A chemical compound in which a group of atoms or ions are attached by a coordination bond to a usually metallic central atom or ion.

→ coordination; → compound.