The derivation is probably from chia, a mucilaginous seed highly esteemed in Mexico.

Hallig-lunn would then mean the island that is more than a hallig; and from the similarity of the words to Heligoland a series of etymological errors may have arisen; but Hallier's derivation is, after all, only a guess.

The derivation of the larger rock is probably HaligstaneHoly Stone.

Derivation, as a topic to be treated by the grammarian, is a species of Etymology, which explains the various methods by which those derivative words which are not formed by mere grammatical inflections, are deduced from their primitives.

The only probable derivations of it that I can find are the old words Doles and ton (from Saxon dun), a village built upon a slip of land between furrows of ploughed earth; or Dale (Dutch Dal), and stone, a bank in a valley.

We should incline to think the slang verb to mosey a mere variety of form, and that its derivation from a certain absconding Mr. Moses (who broke the law of his great namesake through a blind admiration of his example in spoiling the Egyptians) was only a new instance of that tendency to mythologize which is as strong as ever among the uneducated.

But however this may be, the fact that recht and droit became restricted in their meaning to positive law, although much which is not required by law is equally necessary to moral straightness or rectitude, is as significant of the original character of moral ideas as if the derivation had been the reverse way.

I have seen it stated ingeniously that it was of his own coinagefrom agnus, a lambbut the derivation is ad gnoscere, to acknowledge, to recognise, and the word is to be found in other placesin "Othello," for example (Act I., Scene 3, line 232):

The word "frum," the derivation of which is, Anglo-Saxon, "fram," or "from" = strong, flourishing, is the local expression for the bursting of the springs.

It may be noted in passing that the derivation of the word "Moreton-in-the-Marsh" has ever been the subject of much controversy.