From Longman Dictionary of Contemporary Englishdefecatedef‧e‧cate /ˈdefɪkeɪt/ verb [intransitive] HBH formal to get rid of waste matter from your bowels —defecation /ˌdefɪˈkeɪʃən/ noun [uncountable]→ See Verb table
Examples from the Corpus
defecate• Cats feel vulnerable when they are defecating and do not like to have anyone near them at that time.• Why does it not defecate from the tree tops as monkeys and squirrels do?• At the extreme, he might even begin wetting or defecating in bed.• Most individuals experience the urge to defecate on morning awakening and after meals, when colonic motility is known to peak.• What idea does defecating on the flag communicate?• Once the residue left after absorption of foodstuff reaches the last part of the gut, the desire to defecate results.• Cats hate to defecate where they eat and some people place the litter tray too near the animal's food dish.Origin defecate (1400-1500) Latin defaecere, from faex “waste material” 