sem·i·di·am·e·ter 
(sĕm′ē-dī-ămĭ-tər, sĕm′ī-)
(sĕm′ē-dī-ămĭ-tər, sĕm′ī-)n.
The apparent radius of a celestial body when viewed as a disk from Earth.
- parapsychological
- parapsychologist
- parapsychology
- paraquat
- parasail
- parasailer
- parasang
- paraselene
- paraselenic
- parasexual
- parasexuality
- parasexually
- parasite
- parasitic
- parasitical
- parasitically
- parasiticidal
- parasiticide
- parasitism
- parasitize
- parasitoid
- parasitologic
- parasitological
- parasitologist
- parasitology