| placid | Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle. "That placid aspect and meek regard." . "Sleeping . . . The placid sleep of infancy." Origin: L. Placidus, originally, pleasing, mild, from placere to please: cf. F. Placide. See Please. Source: Websters Dictionary (01 Mar 1998) |
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| placidity | The quality or state of being placid; calmness; serenity. Origin: L. Placiditas: cf. F. Placidite. Source: Websters Dictionary (01 Mar 1998) |
| placidly | In a placid manner. Source: Websters Dictionary (01 Mar 1998) |
| placidness | The quality or state of being placid. Source: Websters Dictionary (01 Mar 1998) |
| Placido da Costa's disk | <instrument> An instrument marked with lines or circles by means of which the corneal reflex can be observed. Synonym: Placido da Costa's disk. Origin: kerato-+ G. Skopeo, to examine (05 Mar 2000) |
| Placido da Costa, Antonio | <person> Portuguese ophthalmologist, 1848-1916. See: Placido da Costa's disk. (05 Mar 2000) |