- monochromaticHaving only one color, represented by differing hues and tints. For example shades in a black and white television.
- monismThe doctrine of the oneness and unity of reality, despite the appearance of diversity in the world.
- monopsonyA market situation in which there is only one buyer for a product.
- monochasiumA type of cyme on which each single axis bears one flower.
- monomicticHaving layers of water that intermix only once per year.
- monoprionidianHaving a polyparium with a single row of cells.
- monostichA poem having only one line.
- MonotessaronA harmony of the four Gospels.
- monothalamousWhose spikelets are all similar.
- oneseed juniperA shrub or small tree native to mountains in southwestern North America, Juniperus monosperma