Word:

Protoxide

Pro`tox´ide
n.1.(Chem.) That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
protoxide of nitrogen
laughing gas, now called hyponitrous oxide<-, used as an anaesthetic in dentistry; now (1950-1996) called nitrous oxide, NO ->. See under Laughing.
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Protosilicate
Protosomite
Protosulphide
Protosulphuret
Protosynthex
Prototheria
prototherian
Prototracheata
prototypal
Prototype
Prototyper
prototypic
prototypical
prototyping
Protovertebra
Protovertebral
-- Protoxide --
protoxide of nitrogen
Protoxidize
Protozoa
protozoal
protozoal infection
Protozoan
Protozoic
protozoological
protozoologist
protozoology
Protozoon
Protozoonite
Protracheata
Protract
Protracted
Protracted meeting
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