sem·i·di·ur·nal 
(sĕm′ē-dī-ûrnəl, sĕm′ī-)
(sĕm′ē-dī-ûrnəl, sĕm′ī-)adj.
1. Of, relating to, occurring, or performed during half a day.
2. Occurring or coming approximately once every 12 hours, as the tides.
3. Of or relating to the arc described by a celestial body between its meridian passage and its points of rising or setting.
- sanies
- sanious
- sanitarian
- sanitarily
- sanitarium
- sanitary
- sanitary engineer
- sanitary engineering
- sanitary landfill
- sanitary napkin
- sanitation
- sanitization
- sanitize
- sanity
- San Jacinto River
- San Joaquin River
- San Jose
- San Jose scale
- San José
- San Juan
- San Juan Capistrano
- San Juan Hill
- San Juan Islands
- San Juan Mountains
- sank