退回器：用于动物分娩的一种器械，可将胎畜向后推入子宫，直至头和肢体安放适当以便正常分娩- Sphaeriales
- sphaero-
- Sphaeroides maculatus
- Sphaerophorus
- Sphaerotilus
- sphagiasmus
- sphagitis
- sphenethmoid
- sphenion
- spheno-
- sphenobasilar
- sphenoccipital
- sphenocephalus
- sphenocephaly
- sphenoethmoid
- sphenofrontal
- sphenoid
- sphenoidal
- sphenoiditis
- sphenoidostomy
- sphenoidotomy
- sphenomalar
- sphenomaxillary
- sphenometer
- spheno-occipital