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
Proto-Indo European
— Noun
– English
~ a prehistoric unrecorded language that was the ancestor of all Indo-European languages
proto-oncogene
— Noun
– English
~ a normal gene that has the potential to become an oncogene
Proto-Norse
— Noun
– English
~ the Germanic language of Scandinavia up until about 700
proto
— Adjective
– English
~ indicating the first or earliest or original; "`proto' is a combining form in a word like `protolanguage' that refers to the hypothetical ancestor of another language or group of languages"
protoactinium
— Noun
– English
~ a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
protoanthropology
— Noun
– English
~ the study humans prior to the invention of writing
protoarchaeology
— Noun
– English
~ the study of prehistoric human artifacts and human fossils
protoarcheology
— Noun
– English
~ the study of prehistoric human artifacts and human fossils
protoavis
— Noun
– English
~ most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs
protoceratops
— Noun
– English
~ small horned dinosaur
protocol
— Noun
– English
~ (computer science) rules determining the format and transmission of data