Home › Words › A › alphenalalphenalalphenal · noun — 5-allyl-5-phenylbarbituric acid, a barbiturate derivative formerly used to treat epilepsy and convulsions.Definition from Wiktionary (CC BY-SA 3.0).EtymologyBlend of allyl + phenyl.noun5-allyl-5-phenylbarbituric acid, a barbiturate derivative formerly used to treat epilepsy and convulsions.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.allobarbital 69% match — An early barbiturate once used as an anticonvulsant. vs alphenal →phetharbital 66% match — A barbiturate derivative with anticonvulsant effects and relatively weak sedative action. vs alphenal →alphol 66% match — A crystalline derivative of salicylic acid, used as an antiseptic and antirheumatic. vs alphenal →alfetamine 64% match — A chemical compound of the phenethylamine family, once investigated as a possible antidepressant. vs alphenal →albutoin 64% match — An anticonvulsant drug. vs alphenal →benzobarbital 64% match — A barbiturate derivative with anticonvulsant effects. vs alphenal →brallobarbital 63% match — A barbiturate drug, now disused because of its disagreeable side effects. vs alphenal →cyclobarbital 63% match — A barbiturate derivative. vs alphenal →