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1. a substitute; especially an atom, radical, or group substituted for another in a compound.
2. of or pertaining to such an atom, radical, or group.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A functional group that has replaced another moiety and molecular entity.
Farlex Partner Medical Dictionary © Farlex 2012

Patient discussion about substituent

Q. the substitue ointment for lasonil

A. the active material in it is heparinoid, and if i'm not mistaken there are 2 other creams that uses it. just ask the pharmacist, he is the most qualified to help you.

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References in periodicals archive ?
Microphase Coatings, Inc, 170 Donmoor Court, Garner, NC 27529, USA Table 1: Summary of model predictions for the reaction of TIP with TPG, glycerol, and water Case 1 Case 2 Case 3 Case 4 Number of possible reaction 56 28 10 3 paths Number of reaction paths which 5 (9%) 6 (21%) 2 (20%) 3 (100%) produce intermediate compounds having 3 TPG substituents Number of different products 10 7 5 3 formed Number of products with 0 TPG 4 3 0 1 substituents Number of products with 1 TPG 4 4 3 0 substituent Number of products with 2 TPG 2 0 2 2 substituents
Besides the additional hydrophobation of the silica surface, the long-chain substituents generate a certain steric hindrance for the mercapto group.
The 25 units of the input layer contain chemical information about the first-ring substituent. Through synapse-like connections that can either strengthen or weakne, these units funnel into, and collectively either excite or inhibit, each of the middle layer's five members.
As it can be seen from Table 1, the activation barriers of reactions of olefins with electron-donating substituents are lower compared to the parent (unsubstituted) ethylene except for propene.
Under the present reaction conditions, because of the different substituents on the orthoesters, the reaction time and yield resulting in a slight difference, but both aliphatic and aromatic groups of orthoesters can result in moderate to good yields of the desired product.
The chemical shift [delta]CH=N (ppm) values of all the (E)-1-benzylidene-2-(3-nitrophenyl)hydrazine compounds have been correlated with Hammett substituents constants and F and R parameters using single-linear and multi-linear regression analysis [34-39].
Conclusions: Electron-withdrawing substituents reduced the shift towards the products of the secondary and tertiary Leuckart reactions.
Therefore, the incorporation of these side groups into polyphosphazenes as single substituents or cosubstituents could generate interesting properties.
of 2-substituted phenylhydrazones having substituents other than a methoxy group
Several methods such as incorporation of porous material into the polymer matrix [3-9], thermal degradation of labile graft or block chains in the polyimides [10, 11], introduction of bulk fluorinated substituents into the polymer backbone [9, 12-16], and so forth, were applied to reduce dielectric constant.