लोहितान्मणौ

Operational rule vidhi

The affix कन् comes without changing the sense, after लोहित when it means a precious stone.

Word by word (padaccheda)

Left context लोहितात् pañcamī · ekavacanaRight context मणौ saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

लोहितात् मणौ

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix कन् comes without changing the sense, after लोहित when it means a precious stone.
Thus लोहितकः = लोहितः "Ruby". Why do we say 'when it means a precious stone?' Observe, लोहितः 'red'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.