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سهم sahm
axis
– for sahm: axis (opt.) (lit. ‘arrow’) show/hide quotes-  Alhaz. Opt. 24, 43: appellemus ergo istam lineam axem pyramidis Sabra II 3a, 24: فلنسم هذا الخط سهم المخروط 
-  Alhaz. Opt. 79, 2: Haec igitur linea vocetur axis communis 
- 3 Alhaz. Opt.
cehem
– for sahm: lot, part (point in the zodiac, calculated by adding to the ascendant, astrol.) show/hide quotes-  Albu. Abbr. ch. 1 §1: sexto de nominibus cehem, id est (partium) Yama.: 〈الفصل السادس〉 في جمل ذكر السهام 
-  Albu. Abbr. ch. 6 §55: Cehem inimicorum sic: die noctuve 
- 45 Albu. Abbr.
This sense of the Arabic term is not documented in Lisān, Freytag, Lane, Dozy and Wehr.