missionary position 
noun informal
A position for sexual intercourse in which a couple lie face to face with the woman underneath the man.
Origin
Said to be so named because early missionaries advocated the position as ‘proper’ to primitive peoples, to whom the practice was unknown.
- ostreaceous
- ostreiculture
- ostreiform
- ostreophage
- ostreophagist
- ostrich
- ostrich dinosaur
- ostrich-egg cup
- ostrich farm
- ostrich farmer
- ostrich farming
- ostrich feather
- ostrich fern
- ostrichism
- ostrich meat
- ostrich plume
- ostrich-plumed
- ostrobogulosity
- ostrobogulous
- ostrog
- Ostrogoth
- Ostrogothic
- Ostwald dilution law
- Ostwald, Friedrich Wilhelm
- Ostwald pycnometer