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[ro̅o̅lō′] sing. rouleau
Etymology: Fr, cylinder
red cells in a microscopic roll or "stack-of-coins" formation that may be caused by abnormal proteins, as in multiple myeloma or macroglobulinemia. Compare hemagglutination. See also erythrocyte sedimentation rate.
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Hematology Stacks of RBCs in groups of 4–10 cells, likened to stacked coins; artifactual rouleaux occur in the thick area of any blood smear; true rouleaux formation occurs with ↑ protein, fibrinogen and globulins, ↑ ESR due to dextran and monoclonal gammopathies–myeloma, Waldenström's disease, cryoglobulinemia, sarcoidosis, cirrhosis. See LISS.


(roo-lō′) plural.rouleaux [Fr., roll]
A group of red blood cells that are stuck together, resembling a roll of coins.


The stacking up of red blood cells, caused by extra or abnormal proteins in the blood that decrease the normal distance red cells maintain between each other.
References in periodicals archive ?
A great alternative to traditional baubles, VV Rouleaux has a lovely selection of glitter feather butterflies, from pounds 5.
As well as working with high street stores such as Karen Millen, Whistles, Oasis, Jigsaw and Topshop ( VV Rouleaux trimmings have also appeared on Julien McDonald dresses and the masks worn by Catherine Zeta Jones in Entrapment.
Gladiator, Beauty and the Beast and Kenneth Branagh's Hamlet have all featured Rouleaux items.
VV Rouleaux opens on September 20 at 8-9 Central Arcade.
Min Hogg, editor of World of Interiors, said: 'You just couldn't get beautiful ribbons before VV Rouleaux, such a place didn't exist.
She said: 'VV Rouleaux is the perfect antidote to minimalism.
FUN IN THE SUN: Brown bikini, pounds 7 at Primark; Patterned sarong, pounds 12 at Accessorize (matches both bikinis); Gold sandals, pounds 12 at Accessorize; Straw cowboy hat with shells (can be folded flat), pounds 20 and sunglasses, pounds 12 at Accessorize Shell belt from VV Rouleaux as before