front رو، پیشان ru, pišân Fr.: face, front The part or side of anything that faces forward.
→ ionization front.
Meteo.: A narrow zone of transition between air masses of contrasting density,
that is, air masses of different temperature or different water vapor
concentration or both.
The side of the → planispheric astrolabe that
displays the → limb of the → mater,
the → tympanum, the → rete,
and, in some models, the → rule.
By setting the front, i.e., by rotating the
rete around the mater, one can depict the appearance of the heavens as
determined by observation in order to obtain a time value from the
instrument. Alternatively, by configuring the rete for a given day, one
can perform several astronomical computations such as the rising,
culmination, and setting of the Sun, Moon, planets, and stars
(online museo galileo, VirtualMuseum).
Etymology (EN): From O.Fr. front “forehead, brow,” from L. frontem “forehead,”
perhaps lit. “that which projects,” from PIE *bhront-, from base *bhren-
“to project, stand out.” Etymology (PE): Pišân, from pišâni “front, forehead,” from piš
“before; in front,” from Mid.Pers. pêš “before, earlier;”
O.Pers. paišiya “before; in the presence of” + -ân suffix
of place and time.
Ru “face,” → surface. |
