| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
|---|
| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
|---|
| croton | (noun) tropical Asiatic shrub; source of croton oil | Synonyms: Croton tiglium |
|---|
| (noun) grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant | Synonyms: Codiaeum variegatum |
| crotonbug | (noun) small light-brown cockroach brought to United States from Europe; a common household pest | Synonyms: Blattella germanica, Croton bug, German cockroach, water bug |
|---|
| enterotomy | (noun) surgical operation that creates a permanent opening through the abdominal wall into the intestine | Synonyms: enterostomy |
|---|
| enterotoxemia | (noun) a disease of cattle and sheep that is attributed to toxins absorbed from the intestines | - |
|---|
| enterotoxin | (noun) a cytotoxin specific for the cells of the intestinal mucosa | - |
|---|
| hysterotomy | (noun) surgical incision into the uterus (as in cesarean section) | - |
|---|
| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
|---|
| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
|---|
| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
|---|
| nephrotomy | (noun) incision into a kidney (usually to remove a kidney stone) | - |
|---|
| nephrotoxin | (noun) any toxin that affects the kidneys | - |
|---|
| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
|---|
| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
|---|
| protoanthropology | (noun) the study of humans prior to the invention of writing | Synonyms: protohistory |
|---|
| protoarchaeology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarcheology |
|---|
| protoarcheology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarchaeology |
|---|
| protoavis | (noun) 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) small horned dinosaur | - |
|---|
| protocol | (noun) code of correct conduct | - |
|---|
| (noun) forms of ceremony and etiquette observed by diplomats and heads of state | - |
| (noun) (computer science) rules determining the format and transmission of data | Synonyms: communications protocol |
| protoctist | (noun) any of the unicellular protists | - |
|---|
| protoheme | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, haemitin, hematin, heme |
|---|
| protohemin | (noun) a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood | Synonyms: hemin |
|---|
| protohippus | (noun) Pliocene horse approaching donkeys in size | - |
|---|
| protohistory | (noun) the study of humans prior to the invention of writing | Synonyms: protoanthropology |
|---|
| protology | (noun) the study of origins and first things | - |
|---|
| protomammal | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: therapsid |
|---|
| proton | (noun) a stable particle with positive charge equal to the negative charge of an electron | - |
|---|
| protoplasm | (noun) the substance of a living cell (including cytoplasm and nucleus) | Synonyms: living substance |
|---|
| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
|---|
| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
|---|
| prototype | (noun) a standard or typical example | Synonyms: epitome, image, paradigm |
|---|
| protozoan | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoon |
|---|
| protozoologist | (noun) a zoologist who studies protozoans | - |
|---|
| protozoology | (noun) the branch of zoology that studies protozoans | - |
|---|
| protozoon | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoan |
|---|
| rotogravure | (noun) using photography to produce a plate for printing | Synonyms: photogravure |
|---|
| (noun) printing by transferring an image from a photogravure plate to a cylinder in a rotary press | - |
| (noun) printed material (text and pictures) produced by an intaglio printing process in a rotary press | - |
| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
|---|
| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |
| sclerotomy | (noun) surgical incision of the sclerotic coat of the eye | - |
|---|
| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
|---|
| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
|---|
| trinitrotoluene | (noun) explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene | Synonyms: TNT |
|---|