Embryonic Development

noun a transparent, colorless membrane that envelops the vitreous humor of the eye

• The hyaloid membrane is a transparent layer that surrounds the vitreous humor in the eye.
• I heard that the hyaloid thing in your eye is what helps you see clearly.
• I think my hyaloid is acting up because my vision has been blurry lately.
• His vision was so clear, it was like he had a hyaloid membrane protecting his sight.

noun a medical condition in which a fetus is found inside the body of its twin

preposition in

• Foetus in foetu is a rare condition where a malformed foetus is found inside the body of its twin.
• Did you know there was a case of foetus in foetu where a baby was born with its twin inside it?
• Hey, have you heard about that crazy thing called foetus in foetu?
• The idea of carrying around emotional baggage can be compared to having a foetus in foetu, hidden deep within oneself.