| spontaneous |
happening freely or done by impulse; not forced. [3 definitions] |
| spontaneous combustion |
the ignition of a substance or material, such as oily cloths or wet hay, caused by the rapid increase of heat from chemical reactions in the substance. |
| spontaneous generation |
the theory that living organisms can be created entirely from inanimate matter; abiogenesis. |
| spoof |
a humorous imitation; good-natured mocking; lampoon. [5 definitions] |
| spook |
(informal) a ghost; phantom. [4 definitions] |
| spooky |
eerie and mysterious; weirdly disturbing. |
| spool |
a cylindrical object, usu. with a rim on each end, on which thread, tape, wire, photographic film, or the like is wound. [3 definitions] |
| spoon |
a utensil with a small shallow bowl at the end of a handle, used for eating, stirring, serving, or measuring. [4 definitions] |
| spoonbill |
any of several large wading birds that have a long, flat, spoon-shaped bill. [2 definitions] |
| spoondrift |
spindrift. |
| spoonerism |
a usu. unintentional switching of the initial sounds of two or more words, such as "sped rot" for "red spot". |
| spoon-fed |
fed by a spoon, esp. with liquid or semiliquid food. [2 definitions] |
| spoon-feed |
to feed with a spoon, esp. with liquid or semiliquid food. [2 definitions] |
| spoonful |
the amount a spoon can hold. |
| spoor |
the track, trail, or droppings of a wild animal. |
| sporadic |
occurring irregularly or in a thinly scattered manner in time or space. |
| sporangium |
a plant cell or organ such as a sac or branch that produces spores; spore case. |
| spore |
a tiny reproductive body consisting of one or more cells, produced by ferns, fungi, and other organisms. [2 definitions] |
| spore case |
a sporangium. |
| sporo- |
spore. |
| sporogonium |
the organism in mosses and liverworts that produces spores, usu. a sac or capsule on the stalk. |