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speed up to go or cause to go faster.
speedway a race track for automobiles and motorcycles. [2 definitions]
speedwell any of various wild plants, bushes, or small trees that bear clusters of short-lived blue flowers.
speedy characterized by swift movement or rapidity of accomplishment.
speleology the scientific exploration, examination, and study of caves.
spell1 to name or write the letters of (a word) in order. [4 definitions]
spell2 a word, phrase, or the like used to bewitch or enchant; charm; incantation. [3 definitions]
spell3 a brief, undefined period or interval of time. [4 definitions]
spellbind to hold fascinated, as though under a spell; enchant.
spellbinder someone or something that holds attention as if by a spell, such as a compelling orator or entertainer, or a fascinating book.
spellbound held in fascinated attention, as if by a spell.
spell check a computer program that checks the spelling in a document. [2 definitions]
spelldown see spelling bee.
speller a person who spells words. [2 definitions]
spelling the way one or more words are spelled; orthography. [2 definitions]
spelling bee a spelling competition, esp. one in which any contestant who misspells a word is eliminated.
spell out to describe or explain in detail, so as to make unmistakably clear. [2 definitions]
spelt1 a past tense and past participle of spell1.
spelt2 a hardy wheat grown in Europe and western Asia and used esp. for livestock feed.
spelunk to explore or investigate caves.
spelunker one who explores caves as a hobby or studies them as a profession.