| Noun | 1. | speech disorder - a disorder of oral speech disorder, upset - a physical condition in which there is a disturbance of normal functioning; "the doctor prescribed some medicine for the disorder"; "everyone gets stomach upsets from time to time" anarthria - partial or total loss of articulate speech resulting from lesions of the central nervous system aphonia, voicelessness - a disorder of the vocal organs that results in the loss of voice cataphasia - a speech disorder in which the same word is repeated several times in succession dysarthria - impaired articulatory ability resulting from defects in the peripheral motor nerves or in the speech musculature dyslogia - impaired ability to express ideas verbally; usually resulting from difficulties of reasoning (as in feeblemindedness or certain psychoses) dysphonia - speech disorder attributable to a disorder of phonation lallation - defective articulation of the `l' phoneme or the phoneme `r' is pronounced as `l' lambdacism - speech defect involving excessive use or unusual pronunciation of the phoneme `l' lisp - a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th' |