| 序号 | 英文 | 音标 | 词性 | 中文 |
| | backrun | | | 逆向的, 反转的 |
| | backrush | | | 回卷 |
| | backsaw | `bAksR: | n. | (以金属在背部加厚的)短锯 |
| | backscatter gauging | | | 反向散射测试 |
| | backscatter radar | | | 后向散射雷达 |
| | backscattering | `bAk9skAtErIN | n. | [物]反(向)散射,后向散射 |
| | backscattering spectrometry | | | 反散射能谱法 |
| | backscratcher | `bAk9skrAtFE(r) | n. | 长柄扒 |
| | backscratching | `bAk9skrAtFIN | n. | 为共同利益而互相利用 |
| | backseat | | n. | 后座, 次要位置 |
| | backset | `bAkset | n. | 挫折, 涡流, 倒退, 逆流 |
| | backshaft | | | 后轴 |
| | backshank | | | 针尾 |
| | backsheesh | `bAkFi:F | n. | (=baksheesh)酒钱, 小费 |
| | backshift | | | 准备班, 交叉班 |
| | backshish | | n. | 津贴, 小帐 |
| | backshore beach | | | 镶边手锯 |
| | backshore terrace | | | 海岸滨后阶地 |
| | backshot | | | 排气管内爆音 |
| | backside | 5bAksaId | n. | 背后, 背部, 后方 |
| | backside illumination | | | 背面照度 |
| | backsight | `bAksaIt | n. | 后视, 表尺缺口 |
| | backslap | 5bAkslAp | v. | 拍背以示友好 |
| | backslapper | | n. | <美>过分表示亲密友好的人 |
| | backslapping | | | 过分亲密 |
| | backslash | 5bAkdlAF | | 反斜线符号 |
| | backslash character | | n. | 反斜杠字符 |
| | backslid | | vbl. | backslide的过去式 |
| | backslidden | | vbl. | backslide的过去分词 |
| | backslide | 5bAkslaId | v.；n. | v. 倒退；n. 倒退 |
| | backspace | 5bAkspeIs | vi.；n. | vi. 退后一格；n. 退格 |
| | backspace character | | | 退格符号, 返回[后移]字符 |
| | backspace key | 5bAkspeIs | n. | 退格键 |
| | backspin | 5bAkspIn | n. | (球,轮等的)逆转, 倒旋 |
| | backspin roll | | | 传动托棍 |
| | backsplash | | | 后挡板, 后防溅板 |
| | backstab | | v. | 以卑鄙的手段陷害 |
| | backstabber | | n. | 阴谋暗算他人者,暗箭伤人者,背后中伤者 |
| | backstage | bAk5steIdV | adv. | 在后台, 向后台 |
| | backstair | bAk5steE(r) | adj. | 间接的 |
| | backstairs | bAk5steEz | n.；adj. | n. 后面楼梯, 厨房门；adj. 秘密的, 诡秘的 |
| | backstand | | | (带式抛光机调整抛光带张力的)后座, 张紧座 |
| | backstay | `bAksteI | n. | [船]桅杆, 后部支索撑物 |
| | backstay cable | | | 后拉缆(由桅扯至后舷侧的绳索) |
| | backstep sequence | | | [冶]分段后向法 |
| | backstep welding sequence | | | 分段退焊次序 |
| | backstitch | 5bAkstIF | n.；v. | n. [纺]回针针迹, 倒缝, 连续缝；v. 倒缝 |
| | backstop | | n. | <美>(棒球本垒后的)挡网, 捕手, 支持物, 支撑物 |
| | backstop porter bar | | | 后定位送料杆 |
| | backstop tone | | | 后定位夹钳 |
| | backstrapped | | | [航海]因涨潮或海流关系而无法航行的 |
| | backstreet | | n. | （贫穷地区的）后街小巷 |
| | backstretch | `bAkstretF | n. | <美>(跑道的)非终点直道 |
| | backstroke | 5bAkstrEuk | n.；vt. | n. vi.反手拍球, 仰泳；vt. 用反手击 |
| | backstroke flip turn | | | 仰泳滚翻转身 |
| | backstroke turn indicator | | | 仰泳转身标志线 |
| | backswamp | | | 漫滩沼泽 |
| | backswept | `bAkswept | adj. | 向后倾斜的 |
| | backswept wing aircraft | | | 后掠翼飞机 |
| | backswing | `bAkswIN | n. | 棍棒挥出前的准备姿态, 回复(立场等) |
| | backsword | `bAksR:d | n. | 单刃刀, 木剑 |
| | backswordman | | n. | 使用单刃刀(木刀)者 |
| | backtender | | | 后整理工 |
| | backtrack | 5bAktrAk | vi. | (由原路)返回, 退走, 撤退, 放弃 |
| | backup | 5bAkQp | n.；vt.；adj. | n. 后援, 支持, 阻塞；vt. 做备份；adj. 候补的, 支持性的；adj. [计] 文件备份 |
| | backup aid | | | 备用辅助设备 |
| | backup aircraft | | | 预备机 |
| | backup battery | | | 备用电源, 备份电源 |
| | backup browsers | | | [计] 备份浏览器 |
| | backup command | | n. | 〈计〉备份命令 |
| | backup light | | n. | [汽]倒车灯 |
| | backup processor | | | 后备处理机, 备用处理机 |
| | backup protection | | | 后备保护(装置) |
| | backup radar | | | 辅助雷达 |
| | backup station | | | 备用工位 |
| | backup trap | | | 支持阱 |
| | backveld | `bAkvelt | n. | (南非)偏僻闭塞的乡村地区 |
| | backvelder | | n. | (南非)偏僻闭塞的乡村地区 |
| | backwall | | | 后墙 |
| | backwall photovoltaic effect | | | 后膜光电效应 |
| | backward | 5bAkwEd | adv. | adj.向后地(的), 相反地(的), 追溯, 退步, 由好变坏 |
| | backward action | | | 反向动作 |
| | backward area | | | 落后地区 |
| | backward bound | | | (下旋球)回跳 |
| | backward brush lead | | | 电刷后向超前 |
| | backward chaining | | | 反向链接 |
| | backward channel | | | 反向[控制]信道 |
| | backward child | | | 智力迟钝儿童, 超龄生 |
| | backward class | | | 落后班 |
| | backward compatibility | | n. | 向后兼容 |
| | backward country | | | 经济落后的国家 |
| | backward curve blade | | | 后曲叶片 |
| | backward difference operator | | | 后向差分算子 |
| | backward diode | | | 反向二极管 |
| | backward effect | | | 逆流效应 |
| | backward extrusion | | | 反挤压 |
| | backward feed | | | 逆流送料(法) |
| | backward flashover | | | 反向闪络 |
| | backward flow | | | 逆流, 对流, 反流 |
| | backward folding | | | [地质]背褶皱作用 |
| | backward impedance | | | 反向阻抗 |