محسمة 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.

• مَحْسَمَةٌ

  مَحْسَمَةٌ محسمه محسمة A cause, or means, of cutting off, or stopping; (T, K, TA;) syn. مَقْطَعَةٌ. (T, TA.) So in the saying, هٰذَا مَحْسَمَةٌ لِلدَّآءِ This is a cause, or means, of cutting off, or stopping, the disea…

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