| 序号 | 英文 | 音标 | 词性 | 中文 |
| | Kutaraja | 9kU:tE`rB:jE | | 哥打拉夜(印度尼西亚苏门答腊岛西北端城市班达亚齐) |
| | Kutien | 9kU:`tjen | | 见Gutian |
| | Kuwait | ku5weit | n. | 科威特(中东国家) |
| | Kuwaiti | ku5weiti, kE5waiti | n.；adj. | n. 科威特人；adj. 科威特的, 科威特人的 |
| | Kuweit | kE`weIt | n. | 科威特(中东国家) |
| | Kuybyshev | `kU:IbIFef | n. | 古比雪夫(原苏联城市) |
| | Kuznetsk | kuz`netsk | | Basin 库兹涅茨煤田[苏联西西伯利亚东南部](简称库兹巴斯) |
| | Kwa | kwB: | n. | 克瓦语(西部非洲的一个语族) |
| | Kwajalein | `kwB:dVEleIn | n. | 夸贾林环礁(位于太平洋西部) |
| | Kwakiutl | 7kwB:ki:5u:tl | n. | 夸扣特尔人[语] |
| | Kwan-tu | | n. | 关渡 |
| | Kwan-tu bridge | | n. | 关渡大桥 |
| | Kwan-yin | | n. | <汉> 观音, 观世音菩萨 |
| | Kwando | | n. | 宽渡河(在非洲东南部) |
| | Kwangchow | `gwB:N`dVeu | | 见Guangzhou |
| | Kwangchowan | | n. | 广州湾 |
| | Kwangju | `gwR:N`dVU: | | 光州[南朝鲜城市] |
| | Kwangsi | `gwB:N`si: | | 见Guangxi |
| | Kwangtung | `gwB:N`duN | | 见Guangdong |
| | Kwd | | | =kilowatt-day 千瓦日 |
| | Kweichow | `gweI`dVEu | | 见Guizhou |
| | Kweilin | `gweI`lIn | | 见Guilin |
| | Kweiyang | `gweI`jB:N | | 见Guiyang |
| | Kwr | | | =kilowatts reactive 无功千瓦 |
| | Kyasanur forest virus | | | 科萨努尔森林病毒 |
| | Kyd | | n. | [姓氏] 基德 |
| | Kymric | 5kimrik | n.；adj. | n. (=Welsh)威尔士语；adj. (=Cymric,=Welsh)威尔士人[语]的 |
| | Kymry | `kImrI | n. | 威尔士人, 威尔士之塞尔特人 |
| | Kynewulf | `kInEwulf | | 即Cynewulf |
| | Kyongsong | kI`R:N`sR:N | n. | 汉城 |
| | Kyoto | ki5EutEu | n. | 京都（曾是日本古都） |
| | Kypfos | 5kipfCs | | 马拉松 |
| | Kypzin | 5kipzin | | 代森锌 |
| | Kyrie eleison | 5kiri7ei i5leii7sEun | | 英国圣公会用作对十诫的回答语) |
| | Kyushu | 5kju:5Fu: | n. | <日>九州(日本) |
| | L band | | | 波长76.9-18.3厘米) |
| | L lamination factor | | | 叠层因数 |
| | L of C | | | =Line of Communication 通信线路, 交通线 |
| | L segregate | | | 锭边偏 析 |
| | L square | | | 直角尺[板] |
| | L-asparaginase | 5lAspE5rAdVEneis | n. | [药]左旋天冬醯胺(阻断白血病等癌细胞生长) |
| | L-dopa | | | (=levodopa) [药] 左旋多巴 |
| | L-plate | | n. | L字牌，学习者驾车牌照 |
| | L.A. | | | Los Angeles 洛杉矶 |
| | L.B. | | | [Literarum Baccalaureus] 文学士 |
| | L.C.C. | | abbr. | London County Council, 伦敦郡议会 |
| | L.C.Greek | | n. | 小写希腊字 |
| | L.C.J. | | abbr. | Lord Chief Justice, 高等法院院长 |
| | L.C.L. | | abbr. | Less-than-CarLoad, (铁路运输中的)零担的 |
| | L.D. | | | Doctor of Letters 文学博士 |
| | L/Cpl | | abbr. | (BrE) 一等兵 (Lance-Corporal) |
| | LA | | | =Latin America 拉丁美洲 |
| | LAA | | abbr. | 轻型高射炮兵 |
| | LAB | | | =Labour Advisory Board 劳工咨询委员会 |
| | LABS | | | =Laser Active Boresight System 激光作用瞄准系统 |
| | LAC | | | =Linear Absorption Coefficient 线性吸收系数 |
| | LACES | | | =Los Angeles Council of Engineering Societies 工程学会洛杉矶委员会 |
| | LACR | | | =Low-Altitude Coverage Radar 低空有效区雷达 |
| | LACRR | | | =London Advisory Council for Rubber Research 伦敦橡胶研究咨询委员会 |
| | LAD | | | =Library, Archives and Documentation Services Devision 图书馆、档案及文献工作服务部(联合国UNESCO) |
| | LADS | | | =Low-Altitude Detection System 低空探测系统 |
| | LAFTA | | abbr. | Latin-American Free Trade Association, 拉丁美洲自由贸易协会 |
| | LAI | laI | abbr. | <拉> Linee Aeree Italiane, 意大利航空公司 |
| | LAMA | | | =Local Automatic Message Accounting 本机信息自动计算 |
| | LAMDA | | abbr. | London Academy of Music and Dramatic Art 伦敦音乐戏剧艺术学院 |
| | LAN | | n. | 网络, 局域网, 本地网 |
| | LAN line | | | 局部网络线 |
| | LAN workgroup | | | 局部网络工作组 |
| | LANAC | | | =Laminar Air Navigation and Anti-Collision System 兰那克无线电空中导航与防撞系统 |
| | LANNET | | | =Large Artificial Nerve Network 大型人工神经网络(高速逻辑电路) |
| | LANs | | abbr. | 〈计〉局域网 (local area networks) |
| | LAP | | | =Laboratory of Agro-Pedology 农业土壤学实验室 |
| | LAPM | | | Line Access Protocol for Modem, 调制解调器链路存取协议 |
| | LAPRE | | | =Los Alamos power reactor experiment 洛斯-阿拉莫斯实验动力反应堆 |
| | LAR | | | =Liquid Aircraft Rocket 液体燃料航空火箭 |
| | LARC | | | =Library Automatic Research Communications 图书馆自动化研究通讯 |
| | LARCT | | | =Last Radio Contact[航空]最后一次的无线电联络 |
| | LAS | | | =Laboratory of Atmospheric Sciences 大气科学实验室[美] |
| | LASCR | | | =Light Activated SCR (Silicon Controlled Rectifier)光激硅可控整流器, 光触发开关(元件) |
| | LASCS | | | =Light Activated Silicon Controlled Switch 光激硅可控开关 |
| | LASER | | | =Light Amplification by Stimulated Emission of Radiation 激光器, 受激辐射式光频放大器 |
| | LASL | | | =Los Alamos Scientific Laboratory 洛斯阿拉莫斯科学实验室[美] |
| | LASS | | | =light-activated silicon switch 光触发硅开关 |
| | LATRIX | | | =Light Accessible Transistor Matrix 光存取敏晶体管阵列, 光取数晶体管矩阵 |
| | LAV | lAv | abbr.；n. | abbr. [军] Light Armored Vehicle, 轻型装甲车；n. <口>盥洗室, 洗手间,厕所(lavatory的缩略) |
| | LAW | | | =Light Antitank Weapon 轻型反坦克武器 |
| | LAWCV | | abbr. | [军] Light Armored Wheeled Combat Vehicle, 轮式轻型装甲战车 |
| | LAXD | | | =Low-Angle X-ray Diffraction 小角X射线衍射 |
| | LBA | | | [计] 逻辑块地址 |
| | LBC | | abbr. | 伦敦广播公司 (London Broadcasting Company) |
| | LBD | | | [计] 发光二极管 |
| | LBM | | | =Laser Beam Machining 激光束切削加工 |
| | LBW | | abbr. | [军] Laser Beam Welding, 激光焊 |
| | LC | | | =Landing Craft 登陆艇 |
| | LC meter | | | 电感电容 测试器 |
| | LCA | | abbr. | [军] 印度斯坦航空公司为印度空军研制的单座战斗/攻击机 |
| | LCAC | | abbr. | [军] Landing Craft Air Cushion, 气垫登陆艇 |
| | LCAO | | | =Linear Combination of Atomic Orbitals 原子轨道函数线性组合 |
| | LCB | | | =Limited Capacity Buoy 有限能力浮标 |
| | LCC | | abbr. | [军] Life Cycle Costs, 寿命周期成本 |
| | LCCMARC | | | 国会现行机器读目录文件的图书馆 |