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There are 16 nine-letter words containing PROTO

PROTOAVIS• PROTOAVIS n. a member of the genus Protoavis of the Triassic periods, with dinosaur-like tail and hind legs, but some anatomical features characteristic of modern birds.
PROTOCOLS• protocols n. Plural of protocol.
• PROTOCOL v. to draw up a protocol.
PROTODERM• protoderm n. (Botany) the primary meristem from which the epidermis develops.
• PROTODERM n. the dermatogen, the nascent epidermis, or external cuticle of plants in a forming condition.
PROTOGINE• protogine n. (Geology) A form of granite containing silvery flakes of talc or similar minerals.
• PROTOGINE n. a kind of granite or gneiss containing a silvery talcose mineral.
PROTOGYNY• protogyny n. (Biology) The condition in which an organism begins life as a female and then changes into a male.
• protogyny n. (Botany) The condition of flowers whose female parts mature before the male ones.
• PROTOGYNY n. the development of female organs before male to avoid self-fertilization.
PROTONATE• protonate v. (Chemistry, transitive) To add one or more protons to (a molecule, ion or radical).
• protonate v. (Chemistry, intransitive) To acquire an additional proton.
• PROTONATE v. to acquire an additional proton.
PROTONEMA• protonema n. (Botany) A filament of cells that forms following the germination of the spores of mosses and liverworts.
• PROTONEMA n. a branched filament produced by germination of a moss spore, giving rise to moss plants from buds.
PROTOPODS• protopods n. Plural of protopod.
• PROTOPOD n. a part of a crustacean appendage.
PROTOSTAR• protostar n. (Astronomy) A collection of gas and dust in space with high temperature that usually grows to the point…
• PROTOSTAR n. a condensing mass of gas in the early formation of a star.
PROTOTYPE• prototype n. An original form or object which is a basis for other forms or objects (particularly manufactured items)…
• prototype n. An early sample or model built to test a concept or process.
• prototype n. (Computing) A declaration of a function that specifies the name, return type, and parameters, but none…
PROTOXIDE• protoxide n. (Inorganic chemistry) Any of a series of oxides of a particular metal that has the fewest atoms of oxygen…
• PROTOXIDE n. that one of a series of oxides having the lowest proportion of oxygen, also PROTOXID.
PROTOXIDS• protoxids n. Plural of protoxid.
• PROTOXID n. that one of a series of oxides having the lowest proportion of oxygen, also PROTOXIDE.
PROTOZOAL• protozoal adj. Protozoan.
• PROTOZOAL adj. of or pertaining to the Protozoa.
PROTOZOAN• protozoan n. (Cytology) Any of the diverse group of eukaryotes, of the phylum Protozoa, that are primarily unicellular…
• protozoan adj. Of, pertaining to, or characteristic of a protozoan.
• PROTOZOAN n. any member of the Protozoa, also PROTOZOON.
PROTOZOIC• protozoic adj. Of or relating to the protozoa.
• PROTOZOIC adj. of or pertaining to the protozoa.
PROTOZOON• protozoon n. (Cytology) A protozoan.
• PROTOZOON n. any member of the Protozoa, also PROTOZOAN.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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