(biblical) Any one of the New Testament Epistles of James, 1 and 2 Peter, 1 John, Jude, and sometimes 2 and 3 John, which are not addressed to specific individuals or Churches.

Alternative form of manboy

(botany) any of the flowering plants of the genus Sida in the mallow family

(physics) The interaction of electron spins with heat currents within magnetic materials.