Rototiller (iou) and APTT (medicine)

Rototiller (iou)

Rototiller noun. Chiefly N. Amer. Also rototiller. E20.
[from ROTO- + TILLER noun1.]
= ROTAVATOR.
? Proprietary name.
rototill verb intrans. [back-form.] prepare soil with a Rototiller M20.

APTT (medicine)

aPTT
<abbreviation> Activated partial thromboplastin time.

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