Protium
noun, Chemistry.
1.
the lightest and most common isotope of hydrogen. Symbol: H 1.
noun
1.
the most common isotope of hydrogen, having a mass number of 1
protium pro·ti·um (prō’tē-əm, prō’shē-)
n.
See hydrogen-1.
protium
(prō’tē-əm, -shē-əm)
The most abundant isotope of hydrogen, having an atomic mass of 1. Its nucleus consists of a single proton. See more at hydrogen.
Read Also:
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1. a combining form meaning “first,” “foremost,” “earliest form of,” used in the formation of compound words (protomartyr; protolithic; protoplasm), specialized in chemical terminology to denote the first of a series of compounds, or the one containing the minimum amount of an element. combining form 1. indicating the first in time, order, or rank: protomartyr […]
- Protoactinium
[proh-toh-ak-tin-ee-uh m] /ˌproʊ toʊ ækˈtɪn i əm/ noun, Chemistry. 1. protactinium. protoactinium /ˌprəʊtəʊækˈtɪnɪəm/ noun 1. the former name of protactinium
- Proto-Algonquian
[proh-toh-al-gong-kee-uh n, -kwee-uh n] /ˌproʊ toʊ ælˈgɒŋ ki ən, -kwi ən/ noun 1. the unattested parent language from which the Algonquian languages are descended.
- Protoavis
noun 1. 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 […]
- Protocal
noun, verb 1. a frequent misspelling of protocol. spelling It’s spelled “protocol”.