n. A fragrant balsam said to have been first brought from Santiago de Tolu, in New Granada. See Balsam of Tolu, under Balsam. [ 1913 Webster ]

Tolu tree (Bot.), a large tree (Myroxylon toluiferum), the wood of which is red in the center, and has an aromatic rose odor. It affords the balsam called tolu. [ 1913 Webster ]

n. (Chem.) A salt of any one of the toluic acids. [ 1913 Webster ]

n. [ Tolu + benzene. ] (Chem.) A hydrocarbon, C6H5.CH3, of the aromatic series, homologous with benzene, and obtained as a light mobile colorless liquid, by distilling tolu balsam, coal tar, etc.; -- called also methyl benzene, phenyl methane, etc. [ 1913 Webster ]

n. [ Toluene + -yl. ] (Chem.) Tolyl. [ Obs. ] [ 1913 Webster ]

a. (Chem.) Pertaining to, or designating, one of three metameric acids, CH3.C6H4.CO2H, which are related to toluene and analogous to benzoic acids. They are white crystalline substances, and are called respectively orthotoluic acid, metatoluic acid, and paratoluic acid. [ 1913 Webster ]

n. (Chem.) A complex double tolyl and toluidine derivative of glycocoll, obtained as a white crystalline substance. [ 1913 Webster ]

n. (Chem.) Any one of three metameric amido derivatives of toluene analogous to aniline, and called respectively orthtoluidine, metatoluidine, and paratoluidine; especially, the commonest one, or paratoluidine, which is obtained as a white crystalline substance. [ 1913 Webster ]

☞ It is used in the aniline dye industry, and constitutes the essential nucleus or radical of those dyes. [ 1913 Webster ]

{ } n. [ Tolu + benzol. ] (Chem.) Same as Toluene. [ 1913 Webster ]

a. [ Toluic + uric. ] (Chem.) Of, pertaining to, or designating, any one of three isomeric crystalline acids, C9H10ON.CO2H, which are toluyl derivatives of glycocoll. [ 1913 Webster ]

n. [ L. tolutim on a trot, properly, lifting up the feet, akin to tollere to lift up. ] A pacing or ambling. [ Obs. ] Sir T. Browne. [ 1913 Webster ]