— sinistrally , adv.
/sin"euh streuhl/ , adj.
1. of, pertaining to, or on the left side; left (opposed to dextral ).
2. left-handed.
3. (of certain gastropod shells) coiling counterclockwise, as seen from the apex.
[ 1425-75; late ME sinistralis. See SINISTER, -AL 1 ]