Multiplicative Prefixes from Greek and Latin

In CAS Index Names, Greek prehxes are preferred, except for sesqui- (for one and one-half), nona-(for nine), and undeca- (for eleven). The terms hemi- (Greek) and sesqui- (Latin) are employed by CAS only in hydrate and ammoniate names. A full list is given in Table 3.2. 

The terms bis, iris, tetrakis, etc. (meaning essentially twice, three times, etc.) are used to avoid ambiguity in nomenclature. This is best illustrated by the following example  

In naming ring assemblies the alternative prehxes bi-, ter-, quater-, quinque-, and sexi- are used. 

4 tetra, tert quadric, quadr, quater 30 triconta, triacont 

5 penta, pent quinque, quinqu 31 hentriconta, hentriacont 

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