protochemical
Relating to protochemistry, the early study of chemistry.
Relating to the electrochemical action of protons (rather than electrons).

protochordate
Any chordate of the phyla Hemichordata, Urochordata or Cephalochordata

protochronist
Pertaining to or supporting protochronism ("the idea that Latin or other languages are descended from Romanian").

protoclonal
Relating to a protoclone

protococcoid
Relating to or characteristic of algae of the genus Protococcus.

protocolar
Alternative form of protocolary.

protocolary
The rules of conduct of a diplomat.

protocolic
Relating to protocol

protocollary
Of or pertaining to protocol.

protoconal
Of or pertaining to a protocone

protoconchal
Of or pertaining to a protoconch.

protoconversational
Relating to a protoconversation

protocooperative
Related to, or characterized by protocooperation

protocratic
Pertaining to an initial or original form of social control.

protoctist
Any of several unicellular protists of the kingdom Protista (formerly Protoctista).

protoctistan
protoctist

protoctistans
plural of protoctistan

protoctists
plural of protoctist

protocuneiform
Being or relating to an early system of Sumerian writing that developed into cuneiform.

protodermal
Relating to the protoderm

protodiastolic
Relating to protodiastole

protodoric
Of or relating to a style in which the beginnings of the Doric style are supposed to be found.

protodramatic
Of or relating to primitive art forms representing an early form of drama.

protoecumenical
Beginning or leading up to the ecumenical movement in Christianity.

protoethical
Relating to protoethics.

protofascist
Showing the beginnings of fascism.

protofascists
plural of protofascist

protofeathered
Having protofeathers.

protofeminist
Preceding but anticipating or laying the groundwork for feminism.

protofibrilic
Synonym of protofibrillar.

protofibrillar
Relating to protofibrils

protofibrillary
Alternative form of protofibrillar.

protogalactic
Pertaining to a protogalaxy.

protogastric
That covers the gastric area of brachyuran crabs

protogenal
primitive

protogeneous
primogenial

protogenetic
protogenic

protogenic
Of or pertaining to an early or original race or lineage; primitive.
Relating to crystalline or fire-formed rocks.
Relating to intercellular spaces formed within undifferentiated plant tissues.
A system/dissociative identity that has existed from birth

protoglomerular
Related to or composed of protoglomeruli.

protogynous
Exhibiting protogyny.
Whose female parts (stigma) becomes mature before the male ones (anthers).
Whose female parts (archegonia) mature before the male parts (antheridia) release their spermatozoids.

protoheterothecal
Relating to a protoheterotheca

protohistoric
Of or pertaining to protohistory.

protohistorical
Of or relating to protohistory.

protohominid
Any of several primitive animals that were evolutionary ancestors of the hominids.

protohominids
plural of protohominid

protohomosexual
Relating to the early development of homosexuality, either in an individual or in society.

protohuman
Pertaining to the first humans or the beginning of humankind.

protohumans
plural of protohuman

protohypsodont
That become hypsodont

protoindustrial
Relating to the early beginnings of industrialization.

protolacteal
Describing the secretion of the mammary glands of primitive mammals

protolerogenic
That leads to tolerogenic activity

protoliberal
Similar to liberalism, but before its establishment.

protolingual
Of or relating to proto-language.

protolinguistic
Relating to protolanguage or protolinguistics.

protoliteracy
The state of written language being in its early stages.

protoliterate
With written language that is in its early stages.
In the early stages of learning to read and write.

protolithic
Relating to a protolith.

protoliturgical
Relating to an early or prototypical form of liturgy.

protological
Of or relating to protology.

protologistic
Of or pertaining to protologisms.

protolunar
That will develop to form a moon

protolytic
Relating to protolysis.

protomammalian
Relating to the protomammals.

protomeric
Describing a form of tautomerism in which the isomers differ only in the position of a hydrogen atom (proton).

protometabolic
Relating to protometabolism.

protominimalist
Belonging or pertaining to an early form of minimalism.

protominimalists
plural of protominimalist

protomitochondrial
Relating to a protomitochondrion

protomorphic
Having the most primitive character; in the earliest form of stage.

protonatable
Able to be protonated

protonated
simple past and past participle of protonate

protonemal
Relating to protonemata

protonematal
Relating to protonemata.

protonephridial
Relating to a protonephridium

protonic
Of, pertaining to, or composed of protons.

protonlike
Having the characteristics of a proton

protonmotive
Of or pertaining to the ability to transport protons.

protonolytic
Relating to, or causing protonolysis

protonophoric
Relating to a protonophore

protonymphal
Relating to a protonymph

protooncogenic
Alternative form of proto-oncogenic.

protoorthodox
before Christianity had agreed upon standards

protopathic
Relating to a sensory nerve that detects the presence of a stimulus without determining its location.
Relating to first symptoms of a disease, as in the sense of protopathic bias

protoperithecial
Relating to a protoperithecium

protophilic
Describing a solvent that can accept protons, and is therefore basic.

protophilosophic
Relating to protophilosophy.

protophilosophical
Relating to protophilosophy.

protophobic
Having a low Lewis basicity.
Having a suppressed proton coupling.

protophysical
Relating to protophysics.

protophytic
Of or relating to the protophytes.

protoplanetesimal
A very small protoplanet

protoplanetesimals
plural of protoplanetesimal

protoplasmal
Of or relating to protoplasm.

protoplasmatic
Of or relating to protoplasm.

protoplasmic
Of or relating to protoplasm.

protoplasmodial
Relating to protoplasmodia

protoplasted
Whose protoplast has been regenerated or transformed

protoploid
Formed prior to genome duplication

protopodal
Relating to a protopod

protopodial
Relating to a protopodium.

protopoditic
Relating to a protopodite.

protopoetic
Relating to an early stage in the development of poetry as an art form.

protoproletarian
Of or relating to a protoproletariat.

protoprotestant
Relating to a prototypical form of the Protestant religion.

protopsychological
Being or relating to an earlier form of what is now known as psychology.

protoracist
Alternative form of proto-racist.

protoracists
plural of protoracist

protoreligious
Relating to an early stage in the development of religion.

protosatellite
Describing a ring of dust, surrounding a young planet, out of which moons develop

protoscientific
Relating to protoscience.

protoscolicidal
That leads to death of scolexes

protosexual
Of or relating to formative experiences with regard to sexuality in early life.
Of or relating to a primitive process with some elements of sexuality.

protosocial
Relating to a primitive, relatively simple social system.

protosociological
Being or relating to an earlier form of what is now known as sociology.

protosolar
Describing the conditions prior to the formation of the solar system, or describing the protostar that became the sun

protosomal
Relating to protosomes
Misspelling of proteasomal.

protosplice
Describing a site in a codon into which introns are first inserted

protostelic
Of or possessing a protostele.

protostellar
Of or pertaining to a protostar.

protosteloid
Relating to the protostelids

protostomal
Relating to a protostoma

protostomatous
Of or pertaining to a protostome

protostomian
Of or pertaining to the protostomes

protostomians
plural of protostomian

protostomic
Relating to or composed of protostomes.

protostomous
Of or pertaining to a protostome

protosyllabic
Of or relating to a protosyllable.