Medical Definition of Tachysterol

1. Sterol(s) formed by ultraviolet irradiation of any 5,7-diene-3b-sterol, which breaks the 9,10 bond, but usually from either or both of ergosterol and lumisterol to produce tachysterol2 (ertacalciol, (6E,22E)-9,10-secoergosta-5(10),6,8,22-tetraen-3b-ol) and from 7-dehydrocholesterol to produce tachysterol3 (tacalciol,(6E,3S)-9,10-secocholesta-5(10),6,8-trien-3b-ol). When reduced to the 5,7-diene (or 5,7,22-triene) form, dihydrotachysterol3 (10,19-dihydrocalciol) or dihydrotachysterol2 (10,19-dihydroercalciol), antirachitic action appears. This property has been of therapeutic interest, but tachysterol is being replaced by the true vitamin D hormone (calcitriol) and its derivatives. (05 Mar 2000)

Lexicographical Neighbors of Tachysterol

tachylyte
tachylytes
tachymeter
tachyon
tachyonic
tachyons
tachypacing
tachyphagia
tachyphasia
tachyphemia
tachyphrasia
tachyphylaxis
Tachypleus
tachypnea
tachyrhythmia
tachysterol (current term)
tachysystole
tachyzoite
tacit
tacitly
tacitness
tacitnesses
taciturn
taciturnities
taciturnity
taciturnly
tacit consent
tack
tackboard
tackboards

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