DIASTOLE, DIASTOLY noun [Gr., to set or send from.] 1. Among physicians, a dilation of the heart, auricles and arteries; opposed to systole or contraction. 2. In grammar, the extension of a syllable; or a figure by which a syllable naturally short is made long.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI