| holdfast | 1. Something used to secure and hold in place something else, as a long fiat-headed nail, a catch a hook, a clinch, a clamp, etc.; hence, a support. "His holdfast was gone." 2. <botany> A conical or branching body, by which a seaweed is attached to its support, and differing from a root in that it is not specially absorbent of moisture. Source: Websters Dictionary (01 Mar 1998) |
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| cell organelle | <cell biology> A structurally discrete component of a cell. (18 Nov 1997) |
| organelle | <cell biology> A structurally discrete component of a cell. (18 Nov 1997) |