hole - an unoccupied space

cutis, skin, tegument - a natural protective covering of the body; site of the sense of touch; "your skin is the largest organ of your body"

duct, epithelial duct, canal, channel - a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs"

ostiole - a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass

aperture - a natural opening in something

hydathode, water pore, water stoma - a pore that exudes water on the surface or margin of a leaf of higher plants

lenticel - one of many raised pores on the stems of woody plants that allow the interchange of gas between the atmosphere and the interior tissue

engross, engulf, steep, soak up, immerse, absorb, plunge - engross (oneself) fully; "He immersed himself into his studies"

cerebrate, cogitate, think - use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments; "I've been thinking all day and getting nowhere"

rivet - hold (someone's attention); "The discovery of the skull riveted the paleontologists"

recall - cause one's (or someone else's) thoughts or attention to return from a reverie or digression; "She was recalled by a loud laugh"

think - focus one's attention on a certain state; "Think big"; "think thin"

zoom in - examine closely; focus one's attention on; "He zoomed in on the book"

take heed, listen, hear - listen and pay attention; "Listen to your father"; "We must hear the expert before we make a decision"