• WordNet 3.6
    • n ceratin a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves
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Century Dictionary and Cyclopedia
    • n ceratin The proper substance of horn or horny tissue; the organic substance of the ceratina, entering largely into the composition of epithelial or cuticular structures, as horns, hoofs, nails, etc. Also keratin, keratine.
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In science:

In this range we see that it is possible to have both situations namely, md > mu or md < mu for ceratin values of the parameters.
A Scaling Law for Quark Masses and the CKM matrix
Studying ceratin combinatorial properties of non-unique factorizations have been a sub ject of recent literatures.
The catenary and tame degree of numerical monoids generated by generalized arithmetic sequences
The needed datum for equivariant Hopf Galois coextension is a quadruple (K, B , T , S ) satisfying ceratin properties which is stated in Definition 4.1.
Quantum Groupoids and their Hopf Cyclic Cohomology
In effect, the ˇCerenkov signal which was strong for ceratin fundamental wavelength (due to a constructive interference) is weakened while the one which was initially weak (due to destructive interference) increases.
Parametric wave interaction in quadratic crystal with randomized distribution of ferroelectric domains
To state some results on ceratin soluble groups we need the following definitions.
Engel Elements in Groups