The Collaborative International Dictionary
Methylene \Meth"yl*ene\, n. [F. m['e]thyl[`e]ne, from Gr. ? wine + ? wood; -- a word coined to correspond to the name wood spirit.] (Chem.) A divalent hydrocarbon radical, -CH2-, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene.
Methylene blue (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.
Wiktionary
n. methylene blue
Usage examples of "pure blue".
And if his eyes had been such a pure blue as to give despair to hidalgos, there had been nothing in them but friendship and concern.
It was a beautiful day, the sun bright and cheery, not a single white cloud blocking the pure blue sky.
The sea rolled softly, in sprays of yellow and orange, with a few red jets shooting up on the hillsides, with pools of remnant green in the hollows, under a pure blue sky.
Hadn't Buddha intervened in his behalf, sending down that bolt of pure blue lightning?
With the icy earth beneath her and the pure blue sky above, with the bright sun on his face, they were as pure and primitive as their surroundings.
The green scales went closer to true blue as the color moved up towards the head, until the square snout was a clear pure blue the color of sky.
The rift in the clouds widened until a shelf of massive thunderheads hung over the western three-quarters of Palancar Valley, facing a strip of pure blue sky.
This Robe is of a rich silk of deep pure blue, the blue of the night sky: it is embroidered with golden stars, and with roses and lilies.
Beth rolled over, onto her back, staring up at the pure blue, cloudless sky, then pulled herself up.