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The Collaborative International Dictionary of English v.0.48 (gcide)

Sinistral \Sin"is*tral\, a.
1. Of or pertaining to the left, inclining to the left;
sinistrous; -- opposed to {dextral}.
[1913 Webster]

2. (Zool.) Having the whorls of the spire revolving or rising
to the left; reversed; -- said of certain spiral shells.
[1913 Webster]


counterclockwise \coun"ter*clock"wise\ adj. & adv.
in the opposite direction to that in which the hands of a
clock rotate, as viewed from in front of the clock face; --
of rotatory motion or spiral direction. Opposite of
{clockwise}, or {right-handed}

Note: [Narrower terms: {sinistral} {levororotary,
levorotatory}]

Syn: left-handed.
[PJC]