(countable) An English surname transferred from the given name derived from the Norman French given name Hubald.

(mineralogy) A monoclinic-prismatic mineral containing aluminum, fluorine, hydrogen, iron, magnesium, oxygen, potassium, silicon, sodium, and titanium.

(biochemistry) A protein, in Drosophila and related flies, specified by the bicoid gene, the concentration gradient of which serves to specify which end of the egg will become the head of the fly.

(US, baseball, historical, humorous) Synonym of Three-I League