Definition of "infundibulum" [‖In•fun•dib•u•lum]

• Any of various funnel-shaped bodily passages, openings, structures, or parts, especially: (noun)
• The stalk of the pituitary gland. (noun)
• The calyx of a kidney. (noun)
• The ovarian opening of a fallopian tube. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The middle ethmoidal cells open into the central part of this meatus, and a sinuous passage, termed the infundibulum, extends upward and forward through the labyrinth and communicates with the anterior ethmoidal cells, and in about 50 per cent. of skulls is continued upward as the frontonasal duct into the frontal sinus."
• "Through the hiatus semilunaris the meatus communicates with a curved passage termed the infundibulum, which communicates in front with the anterior ethmoidal cells and in rather more than fifty per cent. of skulls is continued upward as the frontonasal duct into the frontal air-sinus; when this continuity fails, the frontonasal duct opens directly into the anterior part of the meatus."
• "We decided it was time to finally meet, and the daffodil party seemed the perfect time, so we crossed our fingers and hoped a chrono-synclastic infundibulum would not result."