ni·sus /ˈnaɪsəs/ 名詞
1. A striving; an effort; a conatus.
A nisus or energizing towards a presented object. --Hickok.
2. Physiol. (a) The periodic procreative desire manifested in the spring by birds, etc. (b) The contraction of the diaphragm and abdominal muscles to evacuate feces or urine.
n : an effortful attempt to attain a goal [syn: striving, pains,