The meanings of the given abbreviations are the following: Latin, confer, French.
Explanation:
The word iridescent originated from the Latin word iris. That is what the abbreviation L. stands for.
The abbreviation cf. stands for the Latin word confer, which means compare. It states that the listed Latin word should be compared to the following word, which is marked by the abbreviation F., which stands for French. This means that the Latin word iris, which means rainbow, should be compared to the French word iridescent, which means the same as the English one.
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