Webster’s Revised Unabridged Dictionary · 1913
Nisus
Ni′sus, n. (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.
Webster’s Revised Unabridged Dictionary · 1913
Ni′sus, n. (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.