(1):

(n. pl.) Whatever constitutes the principal strength or support of anything; power of endurance; backbone; vigor; as, the stamina of a constitution or of life; the stamina of a State.

(2):

(n. pl.) The fixed, firm part of a body, which supports it or gives it strength and solidity; as, the bones are the stamina of animal bodies; the ligneous parts of trees are the stamina which constitute their strength.

(3):

(n. pl.) See Stamen.

(4):

(pl.) of Stamen