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

1) Something such as a chemical substance, organism, or natural force that causes an effect.
2) Somebody who provides a particular service for another.

From L. agentem (nominative agens, genitive agentis), pr.p. of agere "to set in motion, drive, lead, conduct," → act.

Konešgar, from koneš verbal noun of kardan "to do, to make" (Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base k^wer- "to do, to make") + -gar, → -or.

A substance that brings about an → oxidation. Same as → oxidant and → oxidizer.

→ oxide; → -ize; → -ing; → agent.

A chemical substance that, because of the reactions it causes, is used to detect, measure, or prepare another substance.

From re(act) + → agent.

Vâkonešgar, from vâ-, → re-, + konešgar→ agent.

A substance which removes → oxygen from, or adds → hydrogen, to another substance. In the more general sense, one which loses electrons. Also called → reductant.

→ reduce; → -ing; → agent.