order Psittaciformes
— Noun
– English
～ an order of birds including parrots and amazons and cockatoos and lorikeets and lories and macaws and parakeets
order Psocoptera
— Noun
– English
～ an order of insects: includes booklice and bark-lice
order Pterosauria
— Noun
– English
～ extinct flying reptiles: pterosaurs
os pubis
— Noun
– English
～ one of the three sections of the hipbone; together these two bones form the front of the pelvis
order Pulmonata
— Noun
– English
～ large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails
oil pump
— Noun
– English
～ a pump that keeps a supply of oil on moving parts
on purpose
— Adverb
– English
～ with intention; in an intentional manner; "he used that word intentionally"; "I did this by choice"
off-putting
— Adjective
– English
～ tending to repel; "The trappings of upper-class life are off-putting and sterile"- Elizabeth Hess
off-putting
— Adjective
– English
～ causing annoyance or repugnance; "an off-putting remark"
Ornithogalum pyrenaicum
— Noun
– English
～ Old World star of Bethlehem having edible young shoots
one-flowered pyrola
— Noun
– English
～ delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
optical pyrometer
— Noun
– English
～ a pyrometer that uses the color of the light emitted by a hot object
one-quadrillionth
— Noun
– English
～ one part in a quadrillion equal parts
one-quarter
— Noun
– English
～ one of four equal parts; "a quarter of a pound"
one-quintillionth
— Noun
– English
～ one part in a quintillion equal parts
obstacle race
— Noun
– English
～ a race in which competitors must negotiate obstacles
optic radiation
— Noun
– English
～ a nerve pathway from the lateral geniculate body to the visual cortex