An antigen of the Rhesus system; understood unless otherwise specified to refer to Rhesus factor D (RhD), which appears on the surface of the red blood cells of most (85%) humans. An incompatibility between the Rh-blood types of a mother and her baby may cause serious disease for the baby.

plural of genuine issue of material fact

(astronomy) A bright spot or patch between sunspots.

Alternative spelling of fuckface

(idiomatic) An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences. / (idiomatic) A special talent, ability or quality or its indefinable cause.

Alternative spelling of X factor

Alternative spelling of X factor

Alternative spelling of X factor

simple past tense and past participle of about-face

(idiomatic) To lose the respect of others; to be humiliated or experience public disgrace.