From WordNet (r) 2.0 (August 2003) [wn]:
gravid
adj : in an advanced stage of pregnancy; "was big with child";
"was great with child" [syn: {big(p)}, enceinte,
expectant, {great(p)}, {large(p)}, {heavy(p)}, {with
child(p)}]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gravid \Grav"id\, a. [L. gravidus, fr. gravis heavy, loaded. See
Grave, a.]
Being with child; heavy with young; pregnant; fruitful; as, a
gravid uterus; gravid piety; -- of animals as well as people.
" His gravid associate." --Sir T. Herbert.
[1913 Webster]