| nicotinic agonists | Drugs that bind to and activate nicotinic cholinergic receptors (receptors, nicotinic). Nicotinic agonists act at postganglionic nicotinic receptors, at neuroeffector junctions in the peripheral nervous system, and at nicotinic receptors in the central nervous system. Agents that function as neuromuscular depolarising blocking agents are included here because they activate nicotinic receptors, although they are used clinically to block nicotinic transmission. (12 Dec 1998) |
|---|---|
| nicotinic alcohol | <chemical> 3-pyridinemethanol. A direct-acting peripheral vasodilator that causes flushing and may decrease blood pressure. It is used in vasospasm and threatened gangrene. Pharmacological action: vasodilator agents. Chemical name: 3-Pyridinemethanol (12 Dec 1998) |
| nicotinic antagonists | Drugs that bind to nicotinic cholinergic receptors (receptors, nicotinic) and block the actions of acetylcholine or cholinergic agonists. Nicotinic antagonists block synaptic transmission at autonomic ganglia, the skeletal neuromuscular junction, and at central nervous system nicotinic synapses. (12 Dec 1998) |
| nicotinic cholinergic receptor | A class of receptors responsive to acetylcholine that also are activated by nicotine; ganglionic (including the adrenal medulla) and neuromuscular receptors. Two classes exist: nicotinic-neuronal and nicotinic-muscular. (05 Mar 2000) |
| nicotinic receptors | A class of cholinergic receptors on skeletal muscle cells that are linked to ion channels in the cell membrane. (05 Mar 2000) |
| nicotinomimetic | Mimicking the action of nicotine. (05 Mar 2000) |
| nicotinyl alcohol | <chemical> 3-pyridinemethanol. A direct-acting peripheral vasodilator that causes flushing and may decrease blood pressure. It is used in vasospasm and threatened gangrene. Pharmacological action: vasodilator agents. Chemical name: 3-Pyridinemethanol (12 Dec 1998) |
| nicotinyl tartrate | 3-Pyridinemethanol tartrate;a relatively weak peripheral vasodilator related to nicotinic acid; used in peripheral vascular disorders such as Raynaud's disease, acrocyanosis, and chilblains. (05 Mar 2000) |
| nicoumalone | <chemical> A coumarin that is used as an anticoagulant. Its actions and uses are similar to those of warfarin. Pharmacological action: anticoagulant. Chemical name: 2H-1-Benzopyran-2-one, 4-hydroxy-3-(1-(4-nitrophenyl)-3-oxobutyl)- (12 Dec 1998) |
| nictation | Winking. Synonym: nictation. Origin: L. Nicto, pp. -atus, to wink, fr. Nico, to beckon (05 Mar 2000) |
| nictitate | To wink; to nictate. <anatomy> Nictitating membrance, a thin membrance, found in many animals at the inner angle, or beneath the lower lid, of the eye, and capable of being drawn across the eyeball; the third eyelid; the haw. See: Nictate. Source: Websters Dictionary (01 Mar 1998) |
| nictitating membrane | A transparent fold of skin lying deep to the other eyelids at the mesial side, which may be drawn over the front of the eyeball. It is the so-called third eyelid, found in reptiles and birds generally and in many mammals. (12 Dec 1998) |
| nictitating spasm | Involuntary spasmodic winking. Synonym: spasmus nictitans, winking spasm. (05 Mar 2000) |
| nictitation | Winking. Synonym: nictation. Origin: L. Nicto, pp. -atus, to wink, fr. Nico, to beckon (05 Mar 2000) |
| nidal | Relating to a nidus, or nest. (05 Mar 2000) |