世界上最长的英文单词， 最长的英文单词是“pneumonoultramicroscopicsilicovolcanoconiosis”，有45个字母组成。

1. 长度最长的英文单词是 pneumonoultramicroscopicsilicovolcanoconiosis，中文意思是肺吸尘病。

它有45个字母，是一种慢性肺部疾病，主要是由煤尘和其他放射性物质导致的一种炎症。

2. 第二长的单词是 floccinaucinihilipilification，中文意思是贬低，小看。

它有29个字母，是指对一件东西或事物评价很低，甚至认为毫无价值。

3. 第三长的单词是 antidisestablishmentarianism，中文意思是反宗教分离主义。

它有28个字母，是指19世纪末英国和爱尔兰人反对宗教分离运动的意识形态。

20个最长的英语单词

1. anticonstitutionnellement：

反宪法的 2. pseudopseudohypoparathyroidism：

伪伪性低钙症 3. internationalization：

国际化 4. representations：

表示法 5. pneumonoultramicroscopicsilicovolcanoconiosis：

肺尘肺 6. spectrophotometrically：

分光光度法 7. electroencephalographies：

脑电图 8. counterrevolutionaries：

反革命者 9. antielectron：

反电子 10. interresponsiveness：

相互作用 11. ergonomicists：

人类工效学者 12. superspecialization：

超特殊化 13. hyperoxygenation：

超氧化 14. magnetoelectricity：

磁电 15. superdeveloped：

超发达 16. photosynthetically：

光合作用 17. disproportionableness：

不相称 18. transcontinental：

横贯大陆的 19. unexplainableness：

无法解释的 20. polysaccharide：

多糖

1～100000000的英语单词

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160. one hundred sixty 161. one hundred sixty-one 162. one hundred sixty-two 163. one hundred sixty-three 164. one hundred sixty-four 165. one hundred sixty-five 166. one hundred sixty-six 167. one hundred sixty-seven 168. one hundred sixty-eight 169. one hundred sixty-nine 170. one hundred seventy 171. one hundred seventy-one 172. one hundred seventy-two 173. one hundred seventy-three 174. one hundred seventy-four 175. one hundred seventy-five 176. one hundred seventy-six 177. one hundred seventy-seven 178. one hundred seventy-eight 179. one hundred seventy-nine 180. one hundred eighty 181. one hundred eighty-one 182. one hundred eighty-two 183. one hundred eighty-three 184. one hundred eighty-four 185. one hundred eighty-five 186. one hundred eighty-six 187. one hundred eighty-seven 188. one hundred eighty-eight 189. one hundred eighty-nine 190. one hundred ninety 191. one hundred ninety-one 192. one hundred ninety-two 193. one hundred ninety-three 194. one hundred ninety-four 195. one hundred ninety-five 196. one hundred ninety-six 197. one hundred ninety-seven 198. one hundred ninety-eight 199. one hundred ninety-nine 200. two hundred 201. two hundred one 202. two hundred two 203. two hundred three 204. two hundred four 205. two hundred five 206. two hundred six 207. two hundred seven 208. two hundred eight 209. two hundred nine 210. two hundred ten 211. two hundred eleven 212. two hundred twelve 213. two hundred thirteen 214. two hundred fourteen 215. two hundred fifteen 216. two hundred sixteen 217. two hundred seventeen 218. two hundred eighteen 219. two hundred nineteen 220. two hundred twenty 221. two hundred twenty-one 222. two hundred twenty-two 223. two hundred twenty-three 224. two hundred twenty-four 225. two hundred twenty-five 226. two hundred twenty-six 227. two hundred twenty-seven 228. two hundred twenty-eight 229. two hundred twenty-nine 230. two hundred thirty 231. two hundred thirty-one 232. two hundred thirty-two 233. two hundred thirty-three 234. two hundred thirty-four 235. two hundred thirty-five 236. two hundred thirty-six 237. two hundred thirty-seven 238. two hundred thirty-eight 239. two hundred thirty-nine 240. two hundred forty 241. two hundred forty-one 242. two hundred forty-two 243. two hundred forty-three 244. two hundred forty-four 245. two hundred forty-five 246. two hundred forty-six 247. two hundred forty-seven 248. two hundred forty-eight 249. two hundred forty-nine 250. two hundred fifty 251. two hundred fifty-one 252. two hundred fifty-two 253. two hundred fifty-three 254. two hundred fifty-four 255. two hundred fifty-five 256. two hundred fifty-six 257. two hundred fifty-seven 258. two hundred fifty-eight 259. two hundred fifty-nine 260. two hundred sixty 261. two hundred sixty-one 262. two hundred sixty-two 263. two hundred sixty-three 264. two hundred sixty-four 265. two hundred sixty-five 266. two hundred sixty-six 267. two hundred sixty-seven 268. two hundred sixty-eight 269. two hundred sixty-nine 270. two hundred seventy 271. two hundred seventy-one 272. two hundred seventy-two 273. two hundred seventy-three 274. two hundred seventy-four 275. two hundred seventy-five 276. two hundred seventy-six 277. two hundred seventy-seven 278. two hundred seventy-eight 279. two hundred seventy-nine 280. two hundred eighty 281. two hundred eighty-one 282. two hundred eighty-two 283. two hundred eighty-three 284. two hundred eighty-four 285. two hundred eighty-five 286. two hundred eighty-six 287. two hundred eighty-seven 288. two hundred eighty-eight 289. two hundred eighty-nine 290. two hundred ninety 291. two hundred ninety-one 292. two hundred ninety-two 293. two hundred ninety-three 294. two hundred ninety-four 295. two hundred ninety-five 296. two hundred ninety-six 297. two hundred ninety-seven 298. two hundred ninety-eight 299. two hundred ninety-nine 300. three hundred 301. three hundred one 302. three hundred two 303. three hundred