English word periodo comes from English per-, English iodo
| Dictionary entry | Language | Definition |
|---|---|---|
| per- | English (eng) | (non-productive) Denoting the sense "by" or "per", as in perchance or perhaps. (chemistry) Added to the name of an element in a polyatomic ion denote the number of atoms of that element (usually four).. (chemistry) Forming nouns and adjectives denoting the maximum proportion of one element in a compound, as in peroxide.. (non-productive) In adjectives and adverbs: denoting the sense [...] |
| iodo | English (eng) | |
| periodo | English (eng) | (organic chemistry, especially in combination) Describing a derivative in which all hydrogen atoms have been replaced by iodine. |