161 opaque
odd number /.d nmb./ noun a
number which cannot be exactly divided by two, e.g. 1, 3, 5, 7, etc. . A (battery) cell contains an odd number of plates.
OEM /.υ i em/ abbreviation original
equipment manufacturer offer /.f./ noun something, e.g. a sum of money, that is presented for accept-ance or rejection . He made an offer of $85,000 for the aircraft. . verb 1. to show readiness to do something . He offered to pick up the tickets in advance.
2. to present for acceptance or rejection
. The company offered her a job and she accepted it. 3. to provide . The bat-tery offers a short term power capabil-ity.
official /.f..(.)l/ adjective referring to an authority, such as the government or a recognised organisation . an offi-cial weather report a weather report produced by a meteorological station . noun a person employed by a govern-ment authority or a corporation . An official of the civil aviation department will be visiting today.
offshore /.f../ adjective at a dis-tance from the shore
offshore wind /.f.. w.nd/ noun a
wind which blows from the coast towards the sea. Compare onshore wind
ohm /.υm/ noun a unit of measure-ment of electrical resistance. . ampere
COMMENT: Ohm’s Law states that the current in a circuit is directly proportional to the voltage causing it and inversely proportional to the resistance of the circuit.
oil /..l/ noun a thick mineral liquid used as a fuel or to make mechanical parts move smoothly
oil pan /..l pn/ noun US same as
sump okta /.kt./, octa noun a unit of visi-ble sky equal to one eighth of total area visible to the horizon . The amount of cloud cover is given in oktas.
COMMENT: To measure cloud cover, the sky is divided into imaginary sections, each covering one eighth of the total. A cloudless sky is ‘zero oktas’, and a sky which is completely covered with clouds is ‘eight oktas’ or ‘eight eighths’.
oleo /.υli.υ/ noun a telescopic strut in the undercarriage which absorbs impact loads on landing . A safety switch is fitted in such a way to the oleo, that when the oleo is compressed on the ground, the ‘undercarriage up’ selec-tion cannot be operated. Full form
oleo-pneumatic OM abbreviation outer market omit /.υm.t/ verb to leave out, not to
include . High charts show only infor-mation relevant to high altitude flights and many beacons/aids which are pro-vided for low operations are omitted to keep the chart clear. (NOTE: omitting – omitted)
omni-bearing indicator /.mni be.r.. .nd.ke.t./ noun a cockpit instrument that displays VOR informa-tion and is used for radio navigation. Abbreviation OBI
omni-bearing selector /.mni be.r.. s.lekt./ noun a knob on an omni-bearing indicator which the pilot turns to select a radial from a VOR station. Abbreviation OBS
omnirange /.mnire.nd/ noun a
very-high-frequency radio navigation network that allows pilots to choose and fly on any bearing relative to a transmit-ter on the ground