Select Page



Noun, pl. ostia

1. A small opening or orifice, as in a body organ or passage. (

2. a. Any of the small openings or pores in a sponge. (

b. Each of a number of pores in the wall of a sponge, through which water is drawn in. (Google Dictionary)

3. A mouthlike opening in a bodily part (as a fallopian tube or a blood vessel). (

Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how