os sphenoidale
— Noun
– English
～ butterfly-shaped bone at the base of the skull
Ononis spinosa
— Noun
– English
～ Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots
order Spirochaetales
— Noun
– English
～ higher bacteria; slender spiral rodlike forms
outdoor sport
— Noun
– English
～ a sport that is played outdoors
one-spot
— Noun
– English
～ a domino or die whose upward face shows one pip
oriental spruce
— Noun
– English
～ evergreen tree of the Caucasus and Asia Minor used as an ornamental having pendulous branchlets
order Squamata
— Noun
– English
～ diapsid reptiles: snakes and lizards
old squaw
— Noun
– English
～ a common long-tailed sea duck of the northern parts of the United States
office staff
— Noun
– English
～ professional or clerical workers in an office; "the whole office was late the morning of the blizzard"
oral stage
— Noun
– English
～ (psychoanalysis) the first sexual and social stage of an infant's development; the mouth is the focus of the libido and satisfaction comes from suckling and chewing and biting
outdoor stage
— Noun
– English
～ a platform where a (brass) band can play in the open air
old stager
— Noun
– English
～ an experienced person who has been through many battles; someone who has given long service
oil stain
— Noun
– English
～ a stain produced by oil
one-night stand
— Noun
– English
～ a brief sexual encounter lasting only for a single night; "he ran through a series of loveless one-night stands"
one-night stand
— Noun
– English
～ a performance in one place on one night only
opera star
— Noun
– English
～ singer of lead role in an opera
operatic star
— Noun
– English
～ singer of lead role in an opera