صيرم doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• صَيْرَمٌ

  صَيْرَمٌ ذ A calamity (K, TA) that extirpates everything. (TA. [See also صُرَامٌ, last sentence.]) -A2- Also Firm, or sound, of judgment. (K.) -A3- And i. q. وَجْبَةٌ, (S, M, K,) like صَيْلَمٌ, (TA,) i. e. An eating once…

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