| HEA | hexone-extracted acetone; human erythrocyte antigen |
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| hexone | <chemistry> A liquid hydrocarbon, C6H8, of the valylene series, obtained from distillation products of certain fats and gums. Origin: Hex- + -one. Source: Websters Dictionary (01 Mar 1998) |
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| mannich bases | Ketonic amines prepared from the condensation of a ketone with formaldehyde and ammonia or a primary or secondary amine. A mannich base can act as the equivalent of an alpha,beta unsaturated ketone in synthesis or can be reduced to form physiologically active amino alcohols. (12 Dec 1998) |
| schiff bases | Condensation products of aromatic amines and aldehydes forming azomethines substituted on the n atom, containing the general formula r-n:chr. (12 Dec 1998) |
| histone bases | The alpha-amino acids arginine, histidine, and lysine, which are basic by virtue of the presence in the side chains of a guanidine, imidazole, and amine group, respectively; the term "hexone" is a misnomer since histidine does not have six carbons. (05 Mar 2000) |
| denture bases | The part of a denture that overlies the soft tissue and supports the supplied teeth and is supported in turn by abutment teeth or the residual alveolar ridge. It is usually made of resins or metal or their combination. (12 Dec 1998) |
| ointment bases | Various mixtures of fats, waxes, animal and plant oils and solid and liquid hydrocarbons; vehicles for medicinal substances intended for external application; there are four classes: hydrocarbon base, absorption base, water-removable base and water-soluble base; several are also emollients. (12 Dec 1998) |
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