Feces, faeces, or fæces (see spelling differences

American and British English spelling differences

One of the ways in which American English and British English differ is in spelling.-Historical origins:In the early 18th century, English spelling was not standardized. Differences became noticeable after the publishing of influential dictionaries...

) is a waste product from an animal's digestive tract

Gastrointestinal tract

The human gastrointestinal tract refers to the stomach and intestine, and sometimes to all the structures from the mouth to the anus. ....

 expelled through the anus

Anus

The anus is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may be one or more of: matter which the animal cannot digest,...

 or cloaca

Cloaca

In zoological anatomy, a cloaca is the posterior opening that serves as the only such opening for the intestinal, reproductive, and urinary tracts of certain animal species...

 during defecation

Defecation

Defecation is the final act of digestion by which organisms eliminate solid, semisolid or liquid waste material from the digestive tract via the anus. Waves of muscular contraction known as peristalsis in the walls of the colon move fecal matter through the digestive tract towards the rectum...

.
The word faeces is the plural of the Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 word fæx meaning "dregs". There is no singular form in the English language, making it a plurale tantum

Plurale tantum

A plurale tantum is a noun that appears only in the plural form and does not have a singular variant for referring to a single object...

.
There are many colloquial terms for feces, of which some are considered profanity

Profanity

Profanity is a show of disrespect, or a desecration or debasement of someone or something. Profanity can take the form of words, expressions, gestures, or other social behaviors that are socially constructed or interpreted as insulting, rude, vulgar, obscene, desecrating, or other forms.The...

 (such as shit

Shit

Shit is usually considered vulgar and profane in Modern English. As a noun it refers to fecal matter and as a verb it means to defecate or defecate in; in the plural it means diarrhea...

and crap) while others (such as poo, poop, number two, doodoo, dookie and doody) are not.