Bes·sel 
(bĕsəl), Friedrich Wilhelm 1784-1846.
(bĕsəl), Friedrich Wilhelm 1784-1846. Prussian astronomer who recalculated the orbit of Halley's comet (1804), used parallax to measure the distance from Earth to the twin star 61 Cygni (1838), and developed a class of mathematical functions based on his study of planetary perturbation.
- prelusively
- premalignant
- Premarin
- premarital
- premaritally
- premature
- premature atrial contraction
- premature ejaculation
- prematurely
- prematureness
- premature ventricular contraction
- prematurity
- premaxilla
- premaxillary
- premed
- premedical
- premeditate
- premeditation
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- premeditator
- premenopausal
- premenstrual
- premenstrual dysphoric disorder
- premenstrually
- premenstrual syndrome