(hydrology) A portion of the lithosphere in which the functional interstices of permeable rock or earth are not filled by water under hydrostatic pressure.

(slang) The situation in which one is viewed by a potential partner as a platonic friend, which complicates the initiation of a romantic relationship.

(slang, transitive) To classify as a friend, without any possibility of a romantic relationship.

(astrology) Any of the twelve star signs corresponding to the constellations which make up the zodiac.

plural of zodiac sign

(biochemistry) the major structural protein of the peripheral myelin sheath

(mathematics, of a function) Being equal to the zero function and not merely zero at a particular point in its domain.

(slang) Pizza

(botany) That part of a leaf and petiole that grows from an apical meristem.

(botany) That part of a leaf and petiole that grows from a basal meristem.