| 序号 | 英文 | 音标 | 词性 | 中文 |
| | Lyceum | | n. | （古希腊哲学家亚里士多德执教的） |
| | Lycia | `lIsIE,`lIFIE | n. | 利西亚(小亚细亚西南部临地中海一古国名,后成为罗马帝国的一个省) |
| | Lycian | `lIsIEn,`lIFIEn | adj. | 利西亚语的 |
| | Lycurgan | laI`k\:gEn | adj. | (斯巴达法典制订者)莱克格斯的,莱克格斯立法的,严厉的(亦作Lycurgean,Lycurgian) |
| | Lycurgus | laI`k\:gEs | | 莱克格斯 |
| | Lydgate | 5lidgeit | | 利德盖特(姓氏) |
| | Lydia | 5lidiE | n. | 小亚细亚西部的富裕古国 |
| | Lydian | 5lidiEn, -djEn | adj.；n. | adj. 吕底亚的, 吕底亚人的, 吕底亚语的；n. 吕底亚人, 吕底亚语 |
| | Lydian stone | | n. | (=touchstone) 试金石 |
| | Lyell | 5laiEl | | 莱尔(①姓氏 ②Sir Charles, 1797-1875, 英国地质学家) |
| | Lyle | lail | | 莱尔(姓氏, 男子名) |
| | Lyle gun | | | 抛绳炮[枪] |
| | Lyly | 5lili | | 利利(姓氏) |
| | Lyman | 5laimEn | | 莱曼(姓氏, 男子名) |
| | Lyman continuum | | | 赖曼连续能谱 |
| | Lyman ghost | | | (光谱)赖曼鬼线 |
| | Lyme | laIm | | grass [植]欧滨麦 |
| | Lympany | 5limpEni | | 林帕尼(姓氏) |
| | Lynch | lintF | | 林奇(姓氏) |
| | Lynd | lind | | 林德(姓氏) |
| | Lynite | 5linait | | 莱奈特铜铝合金 |
| | Lynn | lin | | 林恩(姓氏, 男子名, 女子名) |
| | Lyon | 5laiEn | n. | 里昂（法国城市） |
| | Lyons | 5laiEnz | n. | 里昂 |
| | Lyons sausage | | | 里昂香肠(经长期干燥然后熏的猪肉香肠) |
| | Lyra | 5laiErE | n. | [天] 天琴座 |
| | Lyrids | 5lairidz | | [天]天琴座流星群 |
| | Lysenkoism | lai5seNkEuizEm | n. | Lysenko 学说 |
| | Lysidine | 5laisidi:n | | 2-甲基间二氮杂环戊烯-[2] |
| | Lysippus | laI`sIpEs | | 利西波斯(公元前4世纪的希腊雕刻家) |
| | Lysithea | 5laisiWiE | | [天]木卫十 |
| | Lystrosaurus | 9lIstrE`sR:rEs | n. | [动]水龙兽( 古爬行动物) |
| | Lytton | 5litn | | 利顿(①姓氏 ②Edward George Earle, Bulwer-1st Baron, 1803-1873, 英国小说家, 剧作家, 政治家) |
| | M | em | n. | 字母M |
| | M Trk | | | 载重汽车 |
| | M of E | | | =Maintenance of equipment 设备维修(保养) |
| | M of W | | | =Maintenance of way (铁路)养路, 线路养护 |
| | M&E | | abbr. | [军] Medhanical and Electrical, 机械及电气 |
| | M.I.5 | | abbr. | M.I.5, 英国情报局保安处 |
| | M.I.6 | | abbr. | M.I.6, 英国情报局秘密情报部 |
| | M.Litt | | abbr. | 文学硕士 (Master of Letters) |
| | M.P. | | abbr.；abbr. | abbr. Military Police, 宪兵；abbr. Member of Parliament, 下院议员 |
| | M.Phil. | | abbr. | 哲学硕士 (Master of Philos- ophy) |
| | M.Sc | | abbr. | 硕士，理科硕士 (Master of Science) |
| | M.d. | | n. | 医学博士 |
| | M/D | | n. | 发票日, ...月后之同日 |
| | M1 | | | [经] 货币供应量 |
| | M2 | | | [经] 货币供应量之二 |
| | M3 | | | [经] 货币供应量之三 |
| | MA | | abbr. | 文学硕士 (M.A., Master of Arts) |
| | MAA | | abbr. | [军] Mission Area Analysis, 任务区分析 |
| | MAAG | | abbr. | [军] Military Assistance Advisory Group, 军事援助顾问团 |
| | MAB | mAb | | [计] 内存分配块 |
| | MABE | meIb | abbr.；n. | abbr. Master of Agricultural Business and Economics农业经营和经济学硕士 ；n. 人工养殖的珍珠(亦作mabe pearl) |
| | MABIE | | | =Multistage Agitated-bed Ion-exchange 多级搅拌床离子交换 |
| | MABP | | | =molal average boiling point 克分子平均沸点 |
| | MAC | | | =Measurement and Control 测量与控制 |
| | MACE | | | =Machine -Aided Composing Editing 机器辅助排版与编辑 |
| | MACG | | | =Marine Air Control Group 海上空中交通管制大队[美] |
| | MACHGR | | | =Machine Group 机组 |
| | MACMIS | | | =Maintenance And Construction Management information System维修和结构管理信息系统 |
| | MACR | | | =Missing Aircraft Report 失事飞机报告 |
| | MACS | | | =Multiproject Automated Control System 多元自控系统 |
| | MACT | | abbr. | Master of Arts in College Teaching 大学教学硕士 |
| | MACTOR | | | =Matcher-Selector-Connector[信]匹配-选择-连接器 |
| | MAD | | | =machine analysis display 机器分析显示 |
| | MADA | | | =Multiple -Access Discrete Address System[计]多路存取分立地址系统 |
| | MADAEC | | | =Military Application Division of the Atomic EnergyCommission 原子能委员会军用部[美] |
| | MADAR | | | =Malfunction Analysis Detection and Recording 故障分析探索与记录 |
| | MADDAM | | | =Micromodule and Digital Differential Analyzer Machine 微型组件及数字微分分析机 |
| | MADE | | | =Minimum Airborne Digital Equipment 最少机载数字式仪表 |
| | MADIS | | | =Millivolt Analog-Digital Instrumentation System 毫伏模拟数字仪表系统 |
| | MADRE | | | =Magnetic Drum Receiving Equipment 磁鼓接收装置 |
| | MADREC | | | =Malfunction Detection and Recording System 故障探测与记录系统 |
| | MADS | | | =Machine-Aided Drafting System 机器辅助制图系统 |
| | MADT | | | =Microalloy Diffused-base Transistor 微合金扩散(基板)晶体管 |
| | MADW | | | =Military Air Defense Warning (net)军事防空警报网 |
| | MAECON | | | =Mid-America Electronics Convention 中美洲电子学会议 |
| | MAEP | | | =Maps and Aerial Photographs 地图和航空相片 |
| | MAF | | | =Maximum Amplitude Filter 最大幅滤波器 |
| | MAFD | | | =Minimum Acquisition Flux Density 最小获取通量密度 |
| | MAG | | | =Maximum Available Gain 最大可用增益 |
| | MAG MOD | | | =Magnetic Modulator[无]磁调制器 |
| | MAGFET | | | =Magnetic Metal-Oxide-semiconductor Type Field Effect Transistor 磁性金属氧化物半导体型场效应晶体管 |
| | MAGI | | | =Multi-Array Gamma Irradiator 多阵γ线照射器 |
| | MAGIC | | | =Machine for Automatic Graphics Interface to a Computer 与计算机接口的自动图示仪 |
| | MAGLOC | | | =Magnetic Logic Computer 磁逻辑计算机 |
| | MAIR | | | =Maritime Air Force 海上空军, 海军航空兵 |
| | MAK | | | 即MAKE文件，VC4及以前版本使用的工程文件，用来指定如何建立一个工程，VC6把MAK文件转换成DSP文件来处理。 |
| | MALD | | abbr. | Master of Arts in Law and Diplomacy 法律外交学(文科)硕士 |
| | MALLAR | | | =Manned Lunar Landing and Return 载人(的宇宙飞船)月球着陆和返回 |
| | MAMI | | | =Machine-Aided Manufacturing Information (计算)机辅助加工资料 |
| | MAMIE | | | =Minimum Automatic Machine for Interpolation and Extrapolation 内插法和外推法用的微型自动机 |
| | MAMOS | | | =Marine Automatic Meteorological Observing Station 海洋自动气象观测站 |
| | MAN | | | =Magnetic Automatic Navigation 磁性自动导航 |
| | MANAM | | | =Manual Amendment 手工修正 |
| | MANDS | | | =Maintenance and Supply 维修与保养 |
| | MANIAC | | | =Mathematical Analyzer Numerical Integrator ＆ Computer 数学分析器数值积分器和计算机 |
| | MANOP | | | =Manual of Operation 操作手册, 战斗使用条例 |
| | MANS | | | =Member of the Academy of Sciences 自然科学学会会员[美] |
| | MANs | | abbr. | [计] Metropolitan Area Networks, 区域网 |