signet ring

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sig·net ring

the early stage of trophozoite development of the malaria parasite in the red blood cell; the parasite cytoplasm stains blue around its circular margin, and the nucleus stains red in Romanowsky stains, whereas the central vacuole is clear, giving the anular appearance.
A term of art referring to a morphology which by microscopy or an imaging modality has an appearance not unlike that of a signet ring
References in periodicals archive ?
For a contemporary take on the signet ring, try this Thomas Sabo, 18k gold-plated 'compass ring', (above) from PS179 thomassabo.com) or this Alan Crocetti puzzle gold-plated ring, reduced from PS360 to PS108 (matches fashion.com).
For the first stage, the Minister will insert a signet ring into a slot on the laptop.
Signet rings and fobs worn from watch chains were both originally used for the same purpose: impressing one's personal seal on wax when sealing letters.
The seal was usually cut into a hardstone, such as agate, although from the late 19th century, simple gold signet rings engraved with a monogram came to predominate.
His haul included two signet rings, another ring, a watch and lighter worth around pounds 400 and a coin collection that included silver threepenny bits, sixpences and other silver coins, to the value of around pounds 100.
Jewellery was bought as gifts, and men rarely wore anything but watches and signet rings.
The second raid took place the following day in Maltby Close when four signet rings of high sentimental value were stolen.
As reported last month in the Echo, the con-men have been selling men's signet rings and chunky chains engraved with fake hallmarks to unsuspecting members of the public in Cardiff.
Men's signet rings and chunky chains engraved with fake hallmarks are being touted around the streets of Cardiff, Caerphilly and Tredegar for as little as pounds 20 each.
In Chaucer, Troilus's ruby ring is his signet ring, used by him, as signets usually were in English and Scottish royal households in the Middle Ages, to seal communications of a private nature (OED, s.v.