[p_ɹ_ˈəʊ_t_əʊ], [pɹˈə͡ʊtə͡ʊ], [pɹˈə‍ʊtə‍ʊ]

Definitions of proto:

  1.   See prot. – Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  2.   In chem., a prefix in many scientific compounds, denoting the first or smallest degree of a substance which combines with a base, as protoxide, the first or smallest proportion of oxygen; the first or earliest, as protogine; the earliest or lowest, as protozoa. – Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.

Usage examples for proto:

  1. Assume that the diameter of the missing planet was 20, 000 miles; that its solid crust was a thousand miles thick; that under this came a shell of molten metallic matter which was another thousand miles thick; and that the space, 16, 000 miles in diameter, within this, was occupied by the equally dense mass of gases above the " critical point", which, entering into a proto chemical combination, caused the destroying explosion. ” – Essays: Scientific, Political, & Speculative, Vol. I by Herbert Spencer
  2. The entry of the nurse a moment since, with a proto stimulant on a tray, had let him out to tear down the stairs to the garden, rudely thrusting aside the noble owner of the house, out of bounds in a dressing- gown and able to defy Society. ” – When Ghost Meets Ghost by William Frend De Morgan
  3. It is important, then, that I should examine more closely the Proto Egyptian body of doctrine to elucidate the mutual influence of it and the ideas suggested by the practice of mummification. ” – The Evolution of the Dragon by G. Elliot Smith
  4. The proto salts of iron, as is well known to chemists, precipitate gold in the metallic state. ” – Photographic Reproduction Processes by P.C. Duchochois
  5. Some, from a feeling of deep pity for the poor young girl who was to be almost the proto martyr of the new faith. ” – Mistress Margery by Emily Sarah Holt
  6. It had meant something else then, but the proto language of the Hirlaji had no precise meanings; given by itself, it seemed to mean precisely what it said. ” – Warlord of Kor by Terry Gene Carr
  7. Amongst these four was Fray Luis Cancer, whose name was destined to be written in the list of the proto martyrs of the Catholic Church in America. ” – Bartholomew de Las Casas; his life, apostolate, and writings by Francis Augustus MacNutt
  8. Just as in the first dawn of things, when the proto binary compounds of matter gave rise to new relations together with their appropriate laws, so throughout the whole process of evolution, as often as matter acquired a hitherto novel state, or in one of its old states entered into hitherto novel relations, so often would non- existent or even impossible laws become at once possible and necessary. ” – A Candid Examination of Theism by George John Romanes
  9. Such a shield to him was the faith of Stephen the proto martyr. ” – The Expositor's Bible: Ephesians by G. G. Findlay
  10. Thus treated, it bears a certain family likeness to the Doric column; and one understands how Jomard and Champollion, in the first ardour of discovery, were tempted to give it the scarcely justifiable name of " proto Doric." ” – Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt by Gaston Camille Charles Maspero

Rhymes for proto: