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There are 6 fifteen-letter words containing OTRA

AUTOTRANSFORMERautotransformer n. (Electrical engineering) A transformer with a single winding, its output being taken from taps.
AUTOTRANSFORMER n. a transformer in which the primary and secondary coils have part or all of their turns in common.
AUTOTRANSFUSIONautotransfusion n. (Medicine) A blood transfusion in which a person receives their own blood, extracted previously.
AUTOTRANSFUSION n. the return of autologous blood to the patient's own circulatory system.
COTRANSDUCTIONScotransductions n. Plural of cotransduction.
COTRANSDUCTION n. the process by which two genetic markers are simultaneously packaged within a bacteriophage for transfer to a new host bacterium.
HOMOTRANSPLANTShomotransplants n. Plural of homotransplant.
HOMOTRANSPLANT n. a graft of tissue from one individual to another of the same species.
PHOTOTRANSISTORphototransistor n. (Electronics) Any semiconductor device whose electrical characteristics are light-sensitive.
PHOTOTRANSISTOR n. a junction transistor, whose base signal is generated by illumination of the base.
XENOTRANSPLANTSxenotransplants n. Plural of xenotransplant.
XENOTRANSPLANT n. an operation in which an organ or tissue is transferred from one animal to another of a different species.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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