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The Collaborative International Dictionary
Nisus

Nisus \Ni"sus\, n. [L., fr. niti, p. p. nisus, to strive.]

  1. A striving; an effort; a conatus.

    A nisus or energizing towards a presented object.
    --Hickok.

  2. (Physiol.)

    1. The periodic procreative desire manifested in the spring by birds, etc.

    2. The contraction of the diaphragm and abdominal muscles to evacuate feces or urine.

Wiktionary
nisus

n. 1 A mental or physical effort to attain a specific goal; a striving. 2 The periodic procreative desire manifested in the spring by birds, etc. 3 The contraction of the diaphragm and abdominal muscles to evacuate faeces or urine.

WordNet
nisus

n. an effortful attempt to attain a goal [syn: striving, pains, strain]

Wikipedia
Nisus

Nisus may refer to:

Usage examples of "nisus".

You will take the Nisus to sea immediately and hand them to the first senior officer you can.

But now, at this very moment in time, while the little Nisus spread her sails and gathered way from the bay, he could see nothing but complete disgrace, and worse, the scorn of those he had tried for so long to emulate.