solar-powered /s.υl. paυ.d/
adjective powered by energy derived from the suns rays
‘…a 210–240-foot wingspan solar-powered aircraft for flight at 100,000 feet, is being designed in California’ [Pilot]

solar radiation /s.υl. re.di
e..(.)n/ noun the total electromagnetic radiation given off by the sun
solar system /s.υl. s.st.m/ noun
the sun and the planets governed by the
sun sole /s.υl/ adjective only . the sole survivor of the air crash
solenoid /s.l.n..d/ noun a cylindri-cal coil of wire acting as a magnet when carrying electric current . Fuel is metered from the aircraft fuel system by a solenoid-operated control valve.
solid /s.l.d/ adjective 1. referring to something which is not liquid or gase-ous . Visibility is reduced by the pres-ence of solid particles such as dust or sand in the atmosphere. 2. . solid line
unbroken line . noun a substance which is not a liquid or a gas . Ice is a solid, water is a liquid and vapour is a gas.
solid-state /s.l.d ste.t/ adjective
referring to semiconductor devices

solid-state device /s.l.d ste.t d.
va.s/ noun an electronic device that operates by using the effects of electri-cal or magnetic signals in a solid semi-conductor material
solid-state technology /s.l.d ste.t tekn.l.di/ noun technology using the electronic properties of solids to replace those of valves
solo /s.υl.υ/ adverb done by one per-son alone . to go solo or to fly solo . He flew solo across the Atlantic.