• WordNet 3.6
    • adj sinistral of or on the left "a sinistral gastropod shell with the apex upward has its opening on the left when facing the observer","a sinistral flatfish lies with the left eye uppermost"
    • adj sinistral preferring to use left foot or hand or eye "sinistral individuals exhibit dominance of the left hand and eye"
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Webster's Revised Unabridged Dictionary
    • Sinistral (Zoöl) Having the whorls of the spire revolving or rising to the left; reversed; -- said of certain spiral shells.
    • Sinistral Of or pertaining to the left, inclining to the left; sinistrous; -- opposed to dextral.
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Century Dictionary and Cyclopedia
    • sinistral Of or pertaining to the left side; situated on the left hand; not dextral; sinister; sinistrous.
    • sinistral In conchology, reversed from the usual, right, or dextral curve, as the whorls of a spiral shell; whorled toward the left; sinistrorse; heterostrophous. The genus Physa is an example. Some species, genera, etc., of shells are normally sinistral. In some other cases specimens of shell are sinistral as an individual peculiarity, as in the case cited under chank. See cuts under reverse and Physa.
    • sinistral In ichthyology, having both eyes on the left side of the head, as certain flatfishes.
    • sinistral Sinister; wrong.
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Chambers's Twentieth Century Dictionary
    • adj Sinistral belonging or inclining to the left: reversed
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Chambers's Twentieth Century Dictionary


In literature:

The arrival of a beggar on an Island is accounted a sinistrous event.
"A Journey to the Western Isles of Scotland" by Samuel Johnson
The Mokis also are careful to stir medicines according to the sinistral circuit.
"Current Superstitions" by Various
Sinistral: extending to or at the left from the median line.
"Explanation of Terms Used in Entomology" by John. B. Smith
SHELLS, sinistral and dextral, ii.
"The Variation of Animals and Plants Under Domestication, Volume II (of 2)" by Charles Darwin
La femme se fait faire avec joie un enfant, Par l'homme qui tua, sinistre et triomphant.
"The Paliser case" by Edgar Saltus
This is carried outward in a sinistral spiral to the noded shoulder.
"Ancient Pottery of the Mississippi Valley" by William H. Holmes
Spiracle sinistral, lateral, and situated at midbody.
"The Amphibians and Reptiles of Michoacán, México" by William E. Duellman
A sinistrous rage caught him as he repeated the word to himself.
"The Long Lane's Turning" by Hallie Erminie Rives

In poetry:

No black omens on his eyes,
Sinistre--God-sent, darkly broke;
Nor from ruddy earth nor skies,
Portends to him mutely spoke.
"The Helot" by Isabella Valancy Crawford

In news:

Anon, once more the gesture, then begin: Command sinistral pedestal to writhe.

In science:

To obtain the complete set of observable multispinor densities one needs to augment the standard sinistral 6 operators (applied to the left side of the wave function) with new dextral 6 (rightside applied) operators, and also bilateral 6 operators (multivectors applied on both sides of the wave function).
Generalized Fierz Identities and the Superselection Rule for Geometric Multispinors
Note each column of the matrix is a minimal left ideal of the algebra and will hence behave like a column spinor8 for all sinistral 6 (left-sided ) operations.
Generalized Fierz Identities and the Superselection Rule for Geometric Multispinors
The special case sinistral operator, U (λ) = exp[iσj S j /(2|S|)], will leave the spin invariant (as well as the isospin) as it corresponds to a rotation about the spin axis by angle λ.
Generalized Fierz Identities and the Superselection Rule for Geometric Multispinors
Our results are more general than other treatments in that a more complete set of quadratic multispinor densities is introduced which includes sinistral, dextral and bilateral operations.
Generalized Fierz Identities and the Superselection Rule for Geometric Multispinors
Two operators may not commute but will represent compatible observables if one is a dextral operator while the other a sinistral one (left-side applied, e.g. a spintransformation).
Classification of Multivector Theories and the Modification of the Postulates of Physics