[10.]
A syllable is usually a vowel, either alone or in combination with consonants, uttered with a single impulse of stress; but certain consonants may form syllables: oven (= ov-n), battle (= bæt-l); (cf. also the vulgar pronunciation of elm).
A syllable may be (1) weak or strong, (2) open or closed, (3) long or short.
(1) A weak syllable receives a light stress. Its vowel sound is often different from that of the corresponding strong, or stressed, syllable. Cf. weak and strong my in “I want my lárge hat” and “I want mý hat.”
(2) An open syllable ends in a vowel or diphthong: dē-man, to deem; ðū, thou; sca-can, to shake; dæ-ges, by day. A closed syllable ends in one or more consonants: ðing, thing; gōd, good; glæd, glad.
(3) A syllable is long (a) if it contains a long vowel or a long diphthong: drī-fan, to drive; lū-can, to lock; slǣ-pan, to sleep; cēo-san, to choose; (b) if its vowel or diphthong is followed by more than one consonant:[3] cræft, strength; heard, hard; lib-ban, to live; feal-lan, to fall. Otherwise, the syllable is short: ðe, which; be-ran, to bear; ðæt, that; gie-fan, to give.
Note 1.—A single consonant belongs to the following syllable: hā-lig, holy (not hāl-ig); wrī-tan, to write; fæ-der, father.
Note 2.—The student will notice that the syllable may be long and the vowel short; but the vowel cannot be long and the syllable short.
Note 3.—Old English short vowels, occurring in open syllables, have regularly become long in Modern English: we-fan, to weave; e-tan, to eat; ma-cian, to make; na-cod, naked; a-can, to ache; o-fer, over. And Old English long vowels, preceding two or more consonants, have generally been shortened: brēost, breast; hǣlð, health; slǣpte, slept; lǣdde, led.