Veðrum
Veðrum is a term that can refer to several things, depending on the context. In Icelandic, "veður" is the word for weather, and the plural form is "veðri". Therefore, "veðrum" is the dative plural of "veður", meaning "to/for/by/with/in weather". This grammatical form is used when describing actions or states related to weather conditions. For example, one might say "þau voru hrædd við veðrum" which translates to "they were afraid of the weather".
Beyond its literal Icelandic meaning, "Veðrum" might also be used as a proper noun, such as a