Words in english starting with P

• protocol — Noun – English ～ code of correct conduct; "safety protocols"; "academic protocol"
• protocol — Noun – English ～ forms of ceremony and etiquette observed by diplomats and heads of state
• protoctist genus — Noun – English ～ any genus of Protoctista
• protoctist order — Noun – English ～ the order of protoctists
• protoctist — Noun – English ～ any of the unicellular protists
• protoctist family — Noun – English ～ any of the families of Protoctista
• Protoctista — Noun – English ～ in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals
• Pieris protodice — Noun – English ～ common North American form of cabbage butterfly
• protogeometric — Adjective – English ～ characteristic of the earliest phase of geometric art especially in Greece
• protoheme — Noun – English ～ a complex red organic pigment containing iron and other atoms to which oxygen binds
• protohemin — Noun – English ～ a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood
• protohippus — Noun – English ～ Pliocene horse approaching donkeys in size
• protohistory — Noun – English ～ the study humans prior to the invention of writing
• protology — Noun – English ～ the study of origins and first things; "To Christians, protology refers to God's fundamental purpose for humanity"
• protomammal — Noun – English ～ probably warm-blooded; considered direct ancestor of mammals
• proton — Noun – English ～ a stable particle with positive charge equal to the negative charge of an electron
• proton accelerator — Noun – English ～ a collider that collides beams of protons and antiprotons
• protoplasm — Noun – English ～ the substance of a living cell (including cytoplasm and nucleus)
• protoplasmic astrocyte — Noun – English ～ a kind of astrocyte found in the grey matter
• protoplast — Noun – English ～ a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts

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