cycloid noun & adjective. ['sʌɪklɔɪd] M17.
[from Greek kukloeidēs adjective, circular: see CYCLE noun, -OID.]
A. noun.
1. Math. A curve traced by a point on the circumference of a circle (or occas. in some other fixed relation to it) as the circle rolls along a straight line. M17.

2. Psychiatry. = CYCLOTHYMIC noun. E20.
b. adjective.
1. Zoology. Designating fish-scales of approximately circular form with concentric striations; having such scales. M19.

2. Psychiatry. = CYCLOTHYMIC adjective. E20.

■ cy'cloidal adjective (Math.) of, pertaining to, or of the form of a cycloid (CYCLOID noun 1) E18.

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