a coagulation factor formed in the kidney under the influence of vitamin K
photopigment
Noun
a special pigment found in the rods and cones of the retina
provitamin
Noun
vitamin precursor
prothrombinase
Noun
coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors
provitamin A
Noun
an orange isomer of an unsaturated hydrocarbon found in many plants
plasma thromboplastin antecedent
Noun
coagulation factor whose deficiency results in a hemorrhagic tendency
protirelin
Noun
hormone released by the hypothalamus that controls the release of thyroid-stimulating hormone from the anterior pituitary
pitchblende
Noun
a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium
prothrombin
Noun
a protein in blood plasma that is the inactive precursor of thrombin
paraffin wax
Noun
from crude petroleum
pregnanediol
Noun
a compound found in women's urine during certain phases of the menstrual cycle and in the urine of pregnant women
period of time
Noun
an amount of time
pulpwood
Noun
softwood used to make paper
pine knot
Noun
a joint of pine wood used for fuel
pyridoxine
Noun
a B vitamin that is essential for metabolism of amino acids and starch
pyridoxal
Noun
a B vitamin that is essential for metabolism of amino acids and starch
pyridoxamine
Noun
a B vitamin that is essential for metabolism of amino acids and starch
pteroylglutamic acid
Noun
a B vitamin that is essential for cell growth and reproduction
pteroylmonoglutamic acid
Noun
a B vitamin that is essential for cell growth and reproduction
present moment
Noun
at this time
present times
Noun
the circumstances and ideas of the present age
past times
Noun
the time that has elapsed
phylloquinone
Noun
a form of vitamin K
phytonadione
Noun
a form of vitamin K
phillipsite
Noun
a group of white or reddish crystalline minerals of the zeolite family consisting of a hydrous silicate of calcium and potassium and aluminum
philosopher's wool
Noun
oxide of zinc
philosophers' wool
Noun
oxide of zinc
phallic stage
Noun
(psychoanalysis) the third stage in a child's development when awareness of and manipulation of the genitals is supposed to be a primary source of pleasure
phallic phase
Noun
(psychoanalysis) the third stage in a child's development when awareness of and manipulation of the genitals is supposed to be a primary source of pleasure
prepuberty
Noun
a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
puberty
Noun
the time of life when sex glands become functional
pubescence
Noun
the time of life when sex glands become functional
playtime
Noun
time for play or diversion
playday
Noun
time for play or diversion
paid vacation
Noun
a vacation from work by an employee with pay granted
prime of life
Noun
the time of maturity when power and vigor are greatest
puerperium
Noun
time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved
prime time
Noun
the hours between 7 and 11 p.m. when the largest tv audience is available
particular date
Noun
a particular but unspecified point in time
point in time
Noun
an instant of time
payday
Noun
the day on which you receive pay for your work
polling day
Noun
the day appointed for an election
prison term
Noun
the period of time a prisoner is imprisoned
phase of the moon
Noun
a time when the Moon presents a particular recurring appearance
public holiday
Noun
authorized by law and limiting work or official business
psychological moment
Noun
the most appropriate time for achieving a desired effect
print run
Noun
the period that presses run to produce an issue of a newspaper
press run
Noun
the period that presses run to produce an issue of a newspaper