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

→ beta particle.

→ beta particle; → plus; → decay.

1) (prep.) With the addition of.
2) (adj.) Additional; → positive.
3) (n.) An addition; a positive quantity; the → plus sign.

L. plus "more," cognate with Gk. polys "much," Pers. por, → full.

Bišan, from biš "much, more; great" + suffix -an, → minus. The first component from Mid.Pers. veš "more, longer; more frequently," related to vas "many, much" (Mod.Pers. bas); O.Pers. vasiy "at will, greatly, utterly;" Av. varəmi "I wish," vasô, vasə "at one's pleasure or will," from vas- "to will, desire, wish."

The symbol + indicating summation or a positive quantity. The sign is believed to be a shortened form of the L. word et denoting "and" which was the term for addition. The signs + and - first appeared in an arithmetic book by Johannes Widmann entitled Behennde und hübsche Rechnung, published in Leipzig in 1489.

→ plus; → sign.