semidiurnal
adjective
semi·di·ur·nal ˌse-mē-dī-ˈər-nᵊl 
ˌse-ˌmī-,
-mi-
1
: relating to or accomplished in half a day
2
: occurring twice a day
3
: occurring approximately every half day
the semidiurnal tides
Word History
First Known Use
1594, in the meaning defined at sense 1
- touchers
- touches
- touches (on or upon)
- touches (on)
- touches (upon)
- touches base
- touches base (with)
- touches base with
- touches down
- touches off
- touches on
- touches on or upon
- touches up
- touches upon
- touchhole
- touchholes
- touchier
- touchiest
- touchilier
- touchiliest
- touchily
- touchiness
- touchinesses
- touching
- touching (on or upon)