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1. 四级的;四元的;季：quassin 苦木素 | quaternary 四级的;四元的;季 | quinacrine 喹吖因

2. 第四纪第四系：quaternary system 四元系统 | Quaternary 第四纪第四系 | quaternion 四个一组;四人一组;四元数;四元法

3. 第四期：quasi viscous flow 半粘性怜 | quaternary 第四期 | quaternary diagram 四元系状态图

1. the cardinal number that is the sum of three and one

    Synonym: four4IVtetradquaternquaternionquaternityquartetquadrupletfoursomeLittle Joe

1. coming next after the third and just before the fifth in position or time or degree or magnitude

    e.g. the quaternary period of geologic time extends from the end of the tertiary period to the present

    Synonym: fourth4th

2. consisting of or especially arranged in sets of four

    e.g. quaternate leaves
           a quaternary compound

    Synonym: quaternate