-nt adjective
1. archaic : coming forth from a specified place or source
issuant from the eternal throne, came like a cloud of light, the bright response — P.J.Bailey
2. heraldry
a. : depicted or shown as coming forth
a panther with flames issuant from the mouth
b. : depicted or shown as rising upward (as from the top or bottom line of an ordinary or from another bearing or from the base of an escutcheon)
two sprigs issuant
c. of an animal figure : rising upward and having only the upper part visible
a lion rampant issuant from a fess