9-letter words starting with proto
- protoavis — a fossil bird of the genus Protoavis, from the Triassic Period, having a birdlike, partly toothless jaw structure, a tail and hind legs resembling those of the dinosaur, and the hollow bones and keellike breast that are characteristic of modern birds: the oldest known avian type, preceding the archaeopteryx by an estimated 75 million years.
- protocols — the customs and regulations dealing with diplomatic formality, precedence, and etiquette.
- protoderm — a thin outer layer of the meristem in embryos and growing points of roots and stems, which gives rise to the epidermis.
- protogine — a gneissose granite with sericite, found in the Alps
- protonate — to provide an atom, molecule, or ion with a proton
- protonema — a primary, usually filamentous structure produced by the germination of the spore in mosses and certain related plants, and from which the leafy plant which bears the sexual organs arises as a lateral or terminal shoot.
- protopope — the ranking priest in a cathedral of the Eastern Church.
- protostar — an early stage in the evolution of a star, after the beginning of the collapse of the gas cloud from which it is formed, but before sufficient contraction has occurred to permit initiation of nuclear reactions at its core.
- prototype — the original or model on which something is based or formed.
- protoxide — the one of a series of oxides having the smallest proportion of oxygen.
- protozoal — relating to protozoans
- protozoan — any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia.
- protozoic — containing remains of the Earth's earliest life forms
- protozoon — protozoan.
On this page, we collect all 9-letter words starting with PROTO. It’s easy to find right word with a certain length. It is the easiest way to find 9-letter word that beginning with PROTO to use in Scrabble or Crossword puzzles.