هوسهَوَسٌ Somewhat of madness, or insanity, or diabolical possession, (S, A, K,) in the head: (A:) or a vertigo, or giddiness, and confused noise, in the head. (A, TA.) b2:  Hence used by the vulgar to signify Hope. (TA.) مَهَوَّسٌ Affected with somewhat of madness, or insanity, or diabolical possession. (Ibn-'Abbád, K.) b2:  A man who talks to himself. (A.) b3: Sometimes, One who is affected with melancholy, and with vain, or unprofitable, suggestions. (TA.) b4:  And One who occupies himself with the science of alchemy. (TA.)