prothrombin
— Noun
– English
~ a protein in blood plasma that is the inactive precursor of thrombin
prothrombinase
— Noun
– English
~ 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
protirelin
— Noun
– English
~ hormone released by the hypothalamus that controls the release of thyroid-stimulating hormone from the anterior pituitary
protist
— Noun
– English
~ free-living or colonial organisms with diverse nutritional and reproductive modes
Protista
— Noun
– English
~ eukaryotic one-celled living organisms distinct from multicellular plants and animals: protozoa, slime molds, and eukaryotic algae
protistan
— Noun
– English
~ free-living or colonial organisms with diverse nutritional and reproductive modes
Protium
— Noun
– English
~ genus of chiefly tropical American trees having fragrant wood and yielding gum elemi