Webster's 1913 Dictionary
MUREX
Mu "rex, n.; pl. Murices. Etym: [L., the purple fish. ] (Zoöl.)
Defn: A genus of marine gastropods, having rough, and frequently spinose, shells, which are often highly colored inside; the rock shells. They abound in tropical seas.
MUREXAN
Mu *rex "an, n. Etym: [From Murexide. ] (Chem. )
Defn: A complex nitrogenous substance obtained from murexide, alloxantin, and other ureids, as a white, or yellowish, crystalline which turns red on exposure to the air; -- called also uramil, dialuramide, and formerly purpuric acid.
MUREXIDE
Mu *rex "ide, n. Etym: [L. murex the purple fish, purple. ] (Chem. )
Defn: A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. Formerly called also ammonium purpurate.
MUREXOIN
MUREXOIN Mu *rex "o *ïn, n. (Chem. )
Defn: A complex nitrogenous compound obtained as a scarlet crystalline substance, and regarded as related to murexide.
New American Oxford Dictionary
murex
mu rex |ˈmyo͝orˌeks ˈmjʊrɛks | ▶noun ( pl. murices |-rəˌsēz | or murexes ) a predatory tropical marine mollusk, the shell of which bears spines and forms a long narrow canal extending downward from the aperture. [Genus Murex, family Muricidae, class Gastropoda. ] ORIGIN late 16th cent.: from Latin; perhaps related to Greek muax ‘sea mussel. ’
Oxford Dictionary
murex
murex |ˈmjʊərɛks | ▶noun ( pl. murices |-rɪsiːz | or murexes ) a predatory tropical marine mollusc, the shell of which bears spines and forms a long, narrow canal extending downwards from the aperture. ●Genus Murex, family Muricidae, class Gastropoda. ORIGIN late 16th cent.: from Latin; perhaps related to Greek muax ‘sea mussel ’.
The Wordsmith Dictionary