16-letter words starting with sp
- split infinitive — an expression in which there is a word or phrase, especially an adverb or adverbial phrase, between to and its accompanying verb form in an infinitive, as in to readily understand.
- spongy-mesophyll — the lower layer of the ground tissue of a leaf, characteristically containing irregularly shaped cells with relatively few chloroplasts and large intercellular spaces.
- sports equipment — gear used to play sport
- spotted mackerel — a small mackerel, Scomberomorus queenslandicus, of northern Australian waters
- spotted redshank — a sandpiper, Tringa erythropus, which is a large wader with red legs
- spraying machine — a device for spraying large volumes of liquid, such as insecticide onto crops
- spreader-ditcher — a machine for shaping and cleaning roadbeds and ditches and for freeing tracks of ice and snow by plowing and digging.
- spreading center — a linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart.
- spreading factor — a substance, as hyaluronidase, that promotes the diffusion of a material through body tissues
- spring ephemeral — any of various woodland wildflowers that appear above ground in early spring, flower and fruit, and die in a short two-month period.
- spring mountains — a mountain range in S Nevada extending to the California border. Highest peak, Charleston Peak. 11,919 feet (3635 meters).
- spring snowflake — a European amaryllidaceous plant, Leucojum vernum, with white nodding bell-shaped flowers
- springer spaniel — a dog of either of two breeds of medium-sized spaniels, used for flushing and retrieving game.
- sprinkler system — apparatus for automatically extinguishing fires in a building, consisting of a system of water pipes in or below the ceilings, with valves or sprinklers usually made to open automatically at a certain temperature.