micropyle
noun
mi·cro·pyle ˈmī-krə-ˌpī(-ə)l 
1
: a minute opening in the integument of an ovule of a seed plant
2
: a differentiated area of surface in an egg through which a sperm enters
micropylar
ˌmī-krə-ˈpī-lər
adjective 
Example Sentences
Recent Examples on the Web Scientists think the fungus enters the orchid seed through a very small opening in the seed wall called a micropyle. 
BostonGlobe.com, 20 May 2021
BostonGlobe.com, 20 May 2021 Word History
Etymology
French, from micr- + Greek pylē gate
First Known Use
1821, in the meaning defined at sense 1
Medical Definition
micropyle
noun
mi·cro·pyle ˈmī-krə-ˌpīl
: a differentiated area of surface in an egg through which a sperm enters