ceratin

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Definitions from WordNet

Noun ceratin has 1 sense

keratin, ceratin - a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves
--₁ is a kind of scleroprotein, albuminoid
--₁ is a substance of horn; hair; feather, plume, plumage

Definitions from the Web

Certain

Definition:

Certain refers to something that is definite, known, or established without any doubt.

Parts of Speech:

Adjective

Senses:

Firmly established or beyond doubt:

Example: I am certain that she will succeed in her exams.
Example: It is certain that the sun rises in the east.

Particular but not explicitly named or stated:

Example: A certain young man approached me with a request.
Example: She wore a certain type of hat that caught my attention.

Fulfilling some conditions or requirements:

Example: You may go out, but on the condition that you be home by 10 P.M.
Example: The paper should meet certain criteria to be accepted for publication.

Usages:

Certain can be used in various contexts. For instance, it can mean being confident about something, describing a specific but unnamed person or thing, or referring to a specific requirement.

It can also be used as an adverb in informal speech, where it means to some degree or extent.

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