(genetics) A particular homeobox protein and associated gene.

By means of an ultracentrifuge

plural of ultrabook

(computing) A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook.

Highly brachycephalic, beyond hyperbrachycephaly.

Extremely cautious

A pigment which is the residuum of lapis lazuli after the ultramarine has been extracted, and which was formerly used as a middle or neutral tint for flesh, skies, and draperies.

A green pigment obtained as a first product in the manufacture of ultramarine, into which it is changed by subsequent treatment.

plural of ultramarine ash

(astronomy) An observational branch of astronomy, which deals with the study of ultraviolet emission from celestial objects.