subsonic
adj.
also sub-sonic, 1937, from sub- + sonic. Compare supersonic.
〔李〕[sub-=below or less than低，亚；sonic a.音速的 →] a.at a speed less than speed of sound亚音速的
〔蒋〕[sub-亚，次，son声音，-ic形容词后缀，…的] 亚音速的
〔李〕[sub-=below or less than低，亚；sonic a.音速的 →] a.at a speed less than speed of sound亚音速的
〔蒋〕[sub-亚，次，son声音，-ic形容词后缀，…的] 亚音速的