The phrase "microscopic worm" refers to a tiny living creature that cannot be seen with the naked eye. It is an extremely small, worm-like organism that can only be observed under a microscope. Full definition
Sometimes the only evidence that your dog has a parasite infestation is the presence of microscopic worm eggs in the stool that can only be detected by having your vet test a stool sample. (thehousebreakingbible.com)
These are small microscopic worms that feed on flea larvae — a natural way to control flea populations. (petbusiness.com)
So at day 14, the number of nerve and brain cells in the human embryo is zero, and it has less complexity than the simplest microscopic worm and less feeling or intelligence than a parasite in dirty drinking water. (premierchristianity.com)