a (obsolete) Produced by abortion; born prematurely. (defdate|Attested from around (1350 to 1470) until the mid 18th century.)
a Coming to naught; failing in its effect; miscarrying; fruitless; unsuccessful. (defdate|First attested in the late 16th century.)
a (biology) imperfectly | Imperfectly formed or developed; rudimentary; sterile. (defdate|First attested in the mid 18th century.)
n (obsolete) That which is born or brought forth prematurely; an abortion. (defdate|Attested from around (1150 to 1350) until the mid 18th century.)
n (obsolete) A fruitless effort or issue. (defdate|Attested from the early 17th century until the early 18th century.)
v (transitive|obsolete) To cause an abortion; to render without fruit. (defdate|Attested only in the 17th century.)