/ Dictionary / Index L lobular pump: Meaning and Definition of Find definitions for: lob'ular pump' Pronunciation: [key] a blower or pump displacing air or liquid by means of rotors having meshing lobes that act as a seal at their place of mesh. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lobular lobulate Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language