M.
Magnesium, n. A metal, very abundant in sea water and in the earth’s crust. Also found in the composition of animals and some plants.
Mandrake, n. A plant with umbrella-like leaves and a yellow, juicy fruit as large as an egg.
Microscope, n. From two Greek words meaning “small” and “view”; an instrument which magnifies and renders visible bodies too small to be seen by the naked eye.
Moth, n. An insect resembling a butterfly. Moths have no knobs on their antennæ, or “feelers,” and butterflies have.
Mullein, n. A tall, stout weed with thick, wooly leaves.