संस्‍कृतशब्‍दकोशः

Monier–Williams

ऋतुसंधि — { ṛtú-saṃdhi } m. junction of two seasons, transition from one season to the next one &c.##junction of two fortnights, the days of new and full moon ( as the junction of the dark and light half of the month, and reversely )