nyct (o) - [GK] - night 夜
nyctalopia n. 夜盲症 [al=blind; ops=eyes; -ia=disease]
nyctanthous a. (花）夜开的 [anth = flower]
nyctophobia n. [医]黑夜恐怖 [-phobia = fear]
octa-, octa- [GK] = eight 八
octagon n. 八角形 [-gon= a plane figure with. . . angles]
octahedron n. 八面体 [~hedron = a solid figure with ... sides]
October n. 古罗马的八月；公历的十月
octopus n. 章鱼属动物[pus (←pod) = foot]
octocentennial n. 八百周年纪念日
octosyllable n. 八个音节的词或诗句
ole(o)- [L] = oil 油
oleiferous a. 产油的 [-ferous = bearing]
oleograph a. 石印油画 [-graph = sth. drawn] oleomargarine n. 人造黄油，代黄油（margarine n. 黄油）
oleoresin n. [化]含油树脂（resin n. 树脂）
olig(o)- [GK] = few 少，缺
oligarch n. 寡头政治的执政者 [-arch = chief or ruler]
oligemia n. [医]血量减少 [-emia (-aemia) = the state of blood]
oligophagous a. (动物）寡食性的 [-phagous = eating]
oligopoly n. 少数卖主对市场控制 [pol = to sell]
omni- [L] = all 全，总
omnificent a. 有无限创造力的[fic = to make]
omnipotent a. 全能的；有无限权力的[pot= be able]
omniscient a. 无所不知的 [sci = to know]
omnipresent a. 无所不在的
oo- [GK] = egg 卵
oogonium n. [生]卵原细胞 [gon = producing]
oolite n. [地]傾石；鱼卵石[-lite = stone]
oology n. 鸟卵学[-logy=the science of]
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